https://cliffle.com Fortuna Eruditis Favet Copyright 2024 Cliff L. Biffle, All Rights Reserved 1440 Zola en Sat, 14 Dec 2024 00:00:00 +0000 Sat, 14 Dec 2024 00:00:00 +0000 https://cliffle.com/blog/exhubris-super/ https://cliffle.com/blog/exhubris-super/ <p>(This continues my series of posts on the <a href="https://github.com/cbiffle/exhubris/"><code>exhubris</code></a> tools I’m building, to enable more people to use <a href="https://hubris.oxide.computer/">Hubris</a> in their embedded systems.)</p> <p>One of Hubris’s strongest features is its ability to handle crashes in drivers and other application logic. It leaves the specific crash handling behavior up to the application programmer through a mechanism called a <em>supervisor.</em></p> <p>In this post I’ll look at why I made this decision, how it works in practice, and walk through the <code>exhubris</code> supervisor reference implementation, <code>minisuper</code>. (Spoiler: it’s very small.)</p> Mon, 25 Nov 2024 00:00:00 +0000 https://cliffle.com/blog/exhubris/ https://cliffle.com/blog/exhubris/ <p>So in my day-job over at <a href="https://oxide.computer/">Oxide</a> we’ve built this nice embedded operating system called <a href="https://hubris.oxide.computer/">Hubris</a>. If you follow my blog, you’re probably aware of it.</p> <p>I also build a lot of embedded electronics <em>outside</em> my day-job, and people sometimes ask me (often excitedly!) if they’re using Hubris.</p> <p>The answer so far is “no.” This is for a variety of reasons, but probably the biggest: it’s actually quite difficult to use Hubris for anything if you don’t want your code to live in the Oxide Hubris repo!</p> <p>I would like to fix this, to enable other teams to use Hubris without having to coordinate with Oxide (or even publish their source code!). I’m starting by trying to address the needs of a single friendly customer: me.</p> <p>As of this week I have it working, in a set of tools I call <code>exhubris</code>. It’s not by any means <em>done</em> (or all that pleasant to use). I’m going to write some posts about it, to help me think through the design process, and (more importantly!) to solicit <strong>feedback from my readers</strong> on where they think things should go.</p> <p>This first post starts with the part of Hubris most users encounter first: the application configuration file, or <em>appconfig</em>.</p> Mon, 18 Nov 2024 00:00:00 +0000 https://cliffle.com/blog/from-hubris-to-bits/ https://cliffle.com/blog/from-hubris-to-bits/ <p>The embedded platform we’ve built for firmware at <a href="https://oxide.computer/">Oxide</a> is called <a href="https://hubris.oxide.computer/">Hubris</a>. It’s unusual for a microcontroller operating system, and probably the biggest thing that makes it unusual is its use of separately-compiled tasks.</p> <p>Most firmware applications mash all of their task and OS code together in a common memory space, which is simple and efficient, but can lead to subtle bugs. Hubris instead places bits of code in their own isolated memory areas, where they can run (and crash!) separately. This requires that each bit be compiled as a standalone program.</p> <p>The CPUs we target don’t have virtual memory, so each of these separate programs has to be laid out at a known place in the address space. This introduces some challenges, and has prevented us from “just” using an off-the-shelf build system.</p> <p>This post will walk through the process of building a Hubris application from source, from the perspective of the build system, and examine some of these challenges and how we addressed them.</p> Thu, 31 Oct 2024 00:00:00 +0000 https://cliffle.com/blog/recode/ https://cliffle.com/blog/recode/ <p>I have a WASD CODE v2 tenkeyless keyboard, which has been my daily driver for work since about 2017. It’s a great keyboard… mechanically. But its control electronics are fixed-function and don’t quite work the way I want — to say nothing about fancy features like additional key layers.</p> <p>So I fixed it. Now it runs <a href="https://qmk.fm/">QMK</a>. (Or some bare-metal custom Rust firmware.) This has let me…</p> <ul> <li>Try out QMK without the expense (or waste!) of buying a whole new keyboard.</li> <li>Add features that were missing in the original, like USB n-key rollover (NKRO), 1 kHz polling, backlight fade effects, additional key layers, and key macros.</li> <li>Customize the part of the computer I interact with the most!</li> </ul> <p>You can fix your keyboard, too:</p> <ul> <li><a href="https://www.tindie.com/products/owl/recode-qmk-or-rust-upgrade-for-wasd-code-v2/">Buy reCODE from my Tindie store</a> for folks in the US, or</li> <li><a href="https://www.lectronz.com/products/recode-qmk-or-rust-upgrade-for-wasd-code-v2">Buy reCODE from my Lectronz store</a> for folks in the EU/UK.</li> </ul> <p>(If you’re from the rest of the world and would like one, contact me! I have to set up each country separately, and I haven’t had time to do all two-hundred-and-some-odd.)</p> <p>If it’s out of stock on either store, join the waitlist and I’ll make more.</p> <p><img src="/widget/recode/recodev2.webp" alt="A green circuit board nestled between a keyboard’s arrow keys and its insert/delete cluster." /></p> <p>The <a href="/widget/recode/">user manual</a> is pretty basic, but I’ll flesh it out further if the boards sell!</p> <p>Read on below for more background.</p> Tue, 23 Apr 2024 00:00:00 +0000 https://cliffle.com/blog/lilos-1-0/ https://cliffle.com/blog/lilos-1-0/ <p>After five years of development, something like seven art projects, one <a href="https://www.tindie.com/products/owl/keypad-go/">commercial product</a>, and many changes to the dark corners of the Rust language, I’ve decided <a href="https://github.com/cbiffle/lilos/"><code>lilos</code></a> is ready for a 1.0 release!</p> <p>Some parts I’m excited about include:</p> <ul> <li> <p>As of this release, the <code>lilos</code> APIs are entirely cancellation-safe.</p> </li> <li> <p>This release contains contributions from five other people, bringing the total number of contributors to seven! (Want to be number eight? Come say hi!)</p> </li> <li> <p>Thanks to one of those contributors, the operating system tests are now running in CI on QEMU!</p> </li> </ul> <p>(For anyone who’s new, <code>lilos</code> is a tiny embedded operating system that uses Rust <code>async</code> to allow complex multitasking on very limited microcontrollers without requiring dynamic memory allocation. Read more about <code>lilos</code> on my <a href="https://github.com/cbiffle/lilos/">project page</a>, where I link to the docs and provide a curated collection of blog posts on the topic.)</p> <p>See the <a href="https://github.com/cbiffle/lilos/blob/main/RELEASE-NOTES.mkdn#version-100">release notes</a> if you’re curious about what’s changed. If you’ve got firmware written for an earlier version of <code>lilos</code> (particularly the 0.3.x series) and would like to update (you don’t have to!), those release notes will guide you through the process. There have been some breaking API changes, but I promise they’re all improvements.</p> Mon, 08 Apr 2024 00:00:00 +0000 https://cliffle.com/blog/hubris-reply-fault/ https://cliffle.com/blog/hubris-reply-fault/ <p>I’m continuing to reflect on the past four years with <a href="https://hubris.oxide.computer/">Hubris</a> — April Fool’s Day was, appropriately enough, the fourth anniversary of the first Hubris user program, and today is the fourth anniversary of the first kernel code. (I wrote the user program first to help me understand what the kernel’s API wanted to look like.)</p> <p>Of all of Hubris’s design decisions, there’s one that gets a “wait what” response more often than any other. It’s also proving to be a critical part of the system’s overall robustness. In this post, I’ll take a look at our 13th and oddest syscall, <code>REPLY_FAULT</code>.</p> Sun, 24 Mar 2024 00:00:00 +0000 https://cliffle.com/blog/who-killed-the-network-switch/ https://cliffle.com/blog/who-killed-the-network-switch/ <p>We found a neat bug in <a href="https://hubris.oxide.computer/">Hubris</a> this week. Like many bugs, it wasn’t a bug when it was originally written — correct code <em>became</em> a bug as other things changed around it.</p> <p>I thought the bug itself, and the process of finding and fixing it, provided an interesting window into our development process around Hubris. It’s very rare for us to find a bug in the Hubris kernel, mostly because it’s so small. So I jumped at the opportunity to write this one down.</p> <p>This is a tale of how two features, each useful on its own, can combine to become a bug. Read on for details.</p> Tue, 27 Feb 2024 00:00:00 +0000 https://cliffle.com/blog/keypad-go/ https://cliffle.com/blog/keypad-go/ <p>I do a lot of electronics projects in my spare time, and I tend to try to make reusable parts to save myself effort in the future. Because I have to order ingredients in certain quantities, I often wind up with more than I need for my project.</p> <p>So I’ve opened a Tindie store, called Overengineered Widget Laboratories. Right now there’s one product in the store, called <a href="https://www.tindie.com/products/owl/keypad-go/">Keypad:GO</a>. See, I built a sculpture last summer that needed to interact with people through a phone-style keypad. The keypad interface part of it seemed like something other people could use, so I made a few extras. This is a very easy way to interface a keypad or small keyboard to an embedded electronics project, because it handles all the basics for you — matrix scanning, debouncing, key matrix collisions, etc.</p> <p>It will also <em>help you reverse engineer the keypad’s circuit,</em> because often cheap keypads arrive without good documentation. In the tiny flash of the embedded microcontroller, I’ve packed a setup wizard that will walk you through the process of setting up the keypad of your choice. All you need is a terminal program. This is honestly my favorite part, and I demonstrate it in the video below.</p> Sat, 13 Jan 2024 00:00:00 +0000 https://cliffle.com/blog/making-website-faster/ https://cliffle.com/blog/making-website-faster/ <p>Since I started running this site in 2011, I’ve adhered to some principles to make it fast, cheap, and privacy-respecting.</p> <ul> <li>As few third-party cross-domain requests as possible – ideally, none.</li> <li>No trackers (which tends to follow naturally from the above).</li> <li>Use Javascript but don’t <em>require</em> it – the site should work just fine with it disabled, only with some features missing.</li> <li>No server-side code execution – everything is static files.</li> </ul> <p>Out of respect for my readers who don’t have a fancy gigabit fiber internet connection, I test the website primarily on slower, high-latency connections – either a real one, or a simulated 2G connection using Firefox’s dev tools.</p> <p>I was doing an upgrade of my <a href="https://github.com/cbiffle/httpd2/">httpd2</a> software recently and was frustrated at how long the site took to deliver, despite my performance optimizations in the Rust server code. To fix this, I had to work at a much higher level of the stack – where it isn’t about how many instructions are executed or how much memory is allocated, but instead how much data is transferred, when, and in what order.</p> <p>On a simulated 2G connection, I was able to get load times down from 11.20 seconds to 3.44 seconds, and the total amount of data transferred reduced from about 630 kB to about 200 kB. This makes the site faster for everyone, whether you’re rocking gigabit fiber or struggling to get packets through.</p> <p>In this post I’ll walk through how I analyzed the problem, and what changes I made to improve the site.</p> Mon, 08 Jan 2024 00:00:00 +0000 https://cliffle.com/blog/turning-off-http/ https://cliffle.com/blog/turning-off-http/ <p><strong>tl;dr:</strong> Check that your RSS reader is using an HTTPS URL, because the HTTP one will start redirecting soon, and you probably want to find out if it breaks.</p> <p><strong>Edit from four days later:</strong> I’ve flipped the switch on this and, from the logs, it doesn’t seem to be messing anybody up.</p> <hr /> <p>It’s been just about four years since I finally got HTTPS and HTTP/2 working for this site. During that time, I’ve seen most incoming traffic from humans transition over to encrypted connections. (HTTP/2 connections are also significantly faster for both my server, and your user experience, than earlier editions.)</p> <p>You might wondering what I mean by “traffic from humans.” Well, it turns out the vast majority of my remaining unencrypted HTTP traffic (ye olde port 80) is from a combination of:</p> <ul> <li>RSS readers (80%)</li> <li>Shady crawler bots that don’t check robots.txt (15%)</li> <li>Google, for some reason – I’ve poked them about it (~4%)</li> <li>Requests that may be from actual humans (1%ish)</li> </ul> <p>Since I deployed httpd2 back in 2020, I’ve been waiting for an opportunity to turn off <code>publicfile</code>, the HTTP server I’ve used since time immemorial. <code>publicfile</code> has served well, but the code is as archaic as its protocol support, its license makes it difficult to maintain, and (frankly) I’m less excited about appearing to support DJB and his software ecosystem these days.</p> <p>So, I figure I will do the following:</p> <ol> <li>Respond to all HTTP requests with a 301 redirect to HTTPS (…something publicfile can’t actually do out of the box), and</li> <li>Turn on the Strict Transport Security header.</li> </ol> <p>For best results, check your RSS reader today and verify that it’s using an HTTPS URL. It <em>should</em> follow the redirect when I enable it, but, you never know.</p> Mon, 17 Jul 2023 00:00:00 +0000 https://cliffle.com/blog/stm32-wfi-bug/ https://cliffle.com/blog/stm32-wfi-bug/ <p>I really like the STM32 series of microcontrollers in general. They’re generally quite reliable, the peripherals are well tested, and more often than not I can just grab one off the shelf and not think about it too much.</p> <p>However, like every microcontroller, they do contain implementation bugs, so it’s always important to read the “Errata Sheet” (or in ST’s language, “Device Limitations”) when you’re using a part.</p> <p>I appear to have hit an implementation bug in certain STM32 lines that is <em>not</em> listed in the errata sheet. I can’t find any specific description of this bug on the internet, so I’ve attempted to nail one down. Hopefully this will come up in the search results for someone who hits this in the future and save them some time.</p> Mon, 10 Jul 2023 00:00:00 +0000 https://cliffle.com/blog/lilos-cancel-safety/ https://cliffle.com/blog/lilos-cancel-safety/ <p>I’m trying to do something kind of unusual with <a href="https://github.com/cbiffle/lilos/"><code>lilos</code></a>: in addition to almost all the APIs being safe-in-the-Rust sense, I’m also attempting to create an entire system API that is <em>cancel-safe.</em> I’ve written a lot about Rust’s <code>async</code> feature and its notion of cancellation recently, such as <a href="https://cliffle.com/blog/async-inversion/">my suggestion for reframing how we think about <code>async</code>/<code>await</code></a>.</p> <p>My thoughts on this actually stem from my early work on <code>lilos</code>, where I started beating the drum of cancel-safety <a href="https://github.com/cbiffle/lilos/blob/main/doc/cancellation.adoc">back in 2020</a>. My notion of what it means to be cancel-safe has gotten more nuanced since then, and I’ve recently made the latest batch of changes to try to help applications built on <code>lilos</code> be more robust by default.</p> <p>So, wanna nerd out about <code>async</code> API design and robustness? I know you do.</p> Wed, 05 Jul 2023 00:00:00 +0000 https://cliffle.com/blog/async-decl-coords/ https://cliffle.com/blog/async-decl-coords/ <p>I recently posted about <a href="https://cliffle.com/blog/lildb/">my debugger for <code>async</code> Rust</a>, which can generate what I call “await-traces” for <code>async</code> code that’s suspended and not currently running. I mentioned at the time that it appeared possible to get the source code file name and line number corresponding to the await points, but left that for future work.</p> <p>This is an update describing that future work.</p> Tue, 04 Jul 2023 00:00:00 +0000 https://cliffle.com/blog/composed-concurrency-in-drivers/ https://cliffle.com/blog/composed-concurrency-in-drivers/ <p>I recently published <a href="https://cliffle.com/blog/async-inversion/">an article suggesting a different way of looking at <code>async</code> and <code>await</code> in Rust</a>. In it, I discussed strategies for implementing state machines, and explained why I like <code>async</code> as a tool for building such state machines, even without threads.</p> <p>In this post I’ll work through an example of why I’m so excited about this technique, by building a real driver for a notoriously tricky bus one piece at a time, using <a href="https://github.com/cbiffle/lilos/"><code>lilos</code></a>.</p> Fri, 30 Jun 2023 00:00:00 +0000 https://cliffle.com/blog/async-inversion/ https://cliffle.com/blog/async-inversion/ <p>(This is a section of the <a href="https://github.com/cbiffle/lilos/blob/main/doc/intro.adoc"><code>lilos</code> intro guide</a> that people seemed to like, so to increase its visibility, I’m lifting it up into its own post and expanding it a bit. I hope this is a useful companion piece to the <a href="https://cliffle.com/blog/lildb/">post on async debugging</a> I posted this morning.))</p> <p>Some documentation of Rust <code>async</code> and <code>await</code> has presented it as a seamless alternative to threads. Just sprinkle these keywords through your code and get concurrency that scales better! I think this is very misleading. An <code>async fn</code> is a different thing from a normal Rust <code>fn</code>, and you need to think about different things to write correct code in each case.</p> <p>This post presents a different way of looking at <code>async</code> that I think is more useful, and less likely to lead to cancellation-related bugs.</p> Fri, 30 Jun 2023 00:00:00 +0000 https://cliffle.com/blog/lildb/ https://cliffle.com/blog/lildb/ <p>I’m a big fan of Rust’s <code>async</code> feature, which lets you write explicit state machines like straight-line code. One of the operating systems I maintain, <a href="https://github.com/cbiffle/lilos/"><code>lilos</code></a>, is almost entirely based on <code>async</code>, and I think it’s a killer feature for embedded development.</p> <p><code>async</code> is also popular when writing webservers and other network services. My colleagues at Oxide use it quite a bit. Watching them work has underscored one of the current issues with <code>async</code>, however: the debugging story is not great. In particular, answering the question “why <em>isn’t</em> my program currently doing anything” is very hard.</p> <p>I’ve been quietly tinkering on some tools to improve the situation since 2021, and I’ve recently released a prototype debugger for <code>lilos</code>: <a href="https://github.com/cbiffle/lilosdbg/"><code>lildb</code></a>. <code>lildb</code> can print <em>await traces</em> for uninstrumented <code>lilos</code> programs, which are like stack traces, but for suspended futures. I wrote this to help me debug my own programs, but I’m publishing it to try and move the discussion on <code>async</code> debugging forward. To that end, this post will walk through what it does, how it derives the information it uses, and areas where we could improve things.</p> Tue, 22 Nov 2022 00:00:00 +0000 https://cliffle.com/blog/not-thread-safe/ https://cliffle.com/blog/not-thread-safe/ <p>One of the nice things about <a href="https://www.rust-lang.org/">the Rust programming language</a> is that it makes it easier to write correct concurrent (e.g. threaded) programs – to the degree that Rust’s slogan has been, at times, “fearless concurrency.”</p> <p>But I’d like to tell you about the <em>other</em> side of Rust, which I think is under-appreciated. Rust enables you to write programs that are <em>not</em> concurrent. This feature is missing from most other languages, and is a source of much complexity and bugs.</p> <p>“But wait,” you might be saying, “of <em>course</em> I can write code that isn’t concurrent in Java or Python or C!”</p> <p><em>Can you,</em> though? You can certainly write code that <em>ignores</em> concurrency, and would malfunction if (say) used from multiple threads simultaneously. But that’s not the same thing as writing code that <em>isn’t</em> concurrent – code that simply can’t be used concurrently, by compiler guarantee.</p> <p>In Rust, you <em>can.</em> Let’s look at why you can do it, and why it’s awesome.</p> Thu, 31 Mar 2022 00:00:00 +0000 https://cliffle.com/blog/rust-mutexes/ https://cliffle.com/blog/rust-mutexes/ <p>One of the common complaints I hear from systems programmers who try Rust is about <a href="https://en.wikipedia.org/wiki/Lock_(computer_science)">mutexes</a>, and specifically about the Rust Mutex API. The complaints usually go something like this:</p> <ul> <li>They don’t want the mutex to contain data, just a lock.</li> <li>They don’t want to have to manage a “guard” value that unlocks the mutex on drop – often, more specifically, they just want to call an <code>unlock</code> operation because they feel like that’s more explicit.</li> </ul> <p>These changes would make the Rust mutex API equivalent to the C/Posix mutex API. In one case I’ve seen someone try to use <code>Mutex&lt;()&gt;</code> and trickery to fake it.</p> <p>There’s a problem with this, though: these two aspects of <code>Mutex</code>’s design are inextricably linked to one another, and to Rust’s broader safety guarantees – changing either or both of them will open the door to subtle bugs and corruption due to data races.</p> <p>A C-style mutex API consisting of some bundle of implicitly guarded data, plus <code>lock</code> and <code>unlock</code> functions, isn’t wise in Rust because it allows safe code to easily commit errors that break memory safety and create data races.</p> <p>Perhaps controversially, I’d argue that <em>this is also true in C.</em> It’s just more obvious in Rust, because Rust rigorously distinguishes between the notion of “safe” code that cannot commit such errors, and “unsafe” code that <em>can</em> commit such errors if it wishes. C does not make this distinction, and as a result, any code using a mutex in C can trivially produce serious, potentially exploitable, bugs.</p> <p>In the rest of this post I’ll walk through a typical C mutex API, compare with a typical Rust mutex API, and look at what happens if we change the Rust API to resemble C in various ways.</p> Tue, 07 Dec 2021 00:00:00 +0000 https://cliffle.com/blog/rss-back-on/ https://cliffle.com/blog/rss-back-on/ <p>At some point in the past… I dunno, two years or so, it appears that my RSS feeds broke.</p> <p>I use <a href="https://www.getzola.org/">Zola</a> to generate this site, and they don’t have much in the way of a cross-version compatibility guarantee – minor version updates routinely break my templates. (I’m currently stuck on an older version because of <a href="https://github.com/getzola/zola/issues/1687">this bug</a>.) They appear to have changed the names of the RSS-related settings, causing my detection for <code>generate_rss</code> to always return <code>false</code> (because they also seem to default any typo’d configuration key to <code>false</code>). Whee.</p> <p>Anyway, should be back on now – thanks to all the folks who have asked about this.</p> Mon, 06 Dec 2021 00:00:00 +0000 https://cliffle.com/blog/on-hubris-and-humility/ https://cliffle.com/blog/on-hubris-and-humility/ <p>Last week I gave a talk at the Open Source Firmware Conference about some of the work I’m doing at Oxide Computer, entitled <em>On Hubris and Humility.</em> There is <a href="https://talks.osfc.io/osfc2021/talk/JTWYEH/">a video of the talk</a> if you’d like to watch it in video form. It came out pretty alright!</p> <p>The conference version of the talk has a constantly animated background that makes the video hard for some people to watch. OSFC doesn’t appear to be bothering with either captions or transcripts, so my friends who don’t hear as well as I do (or just don’t want to turn their speakers on!) are kind of out of luck.</p> <p>And so, here’s a transcript with my slides inlined. The words may not exactly match the audio because this is written from my speaker’s notes. And, yes, my slides are all character art. The browser rendering is imperfect.</p> <p>I’ve also written an epilogue at the end after the initial response to the talk.</p> <ul> <li><a href="https://github.com/oxidecomputer/hubris">Hubris repo</a></li> <li><a href="https://hubris.oxide.computer/reference/">Hubris reference manual</a> in case you don’t feel like you’ve read enough of my writing today</li> </ul> Wed, 27 Oct 2021 00:00:00 +0000 https://cliffle.com/food/sweet-potatoes/ https://cliffle.com/food/sweet-potatoes/ <p>This is my favorite sweet potato preparation. It produces a creamy puree with a texture like mashed potatoes, but with a flavor that’s somewhere between a side dish and a dessert.</p> Sat, 20 Mar 2021 00:00:00 +0000 https://cliffle.com/food/oatmeal-lace-cookies/ https://cliffle.com/food/oatmeal-lace-cookies/ <p>This is based on a recipe from my mom, who called these cookies “Alexandrites.” Most folks online seem to call them “lace cookies.” Either way, they are delicious. I’ve tweaked these to suit my preferences, of course – while my recipe may be marked “alpha” hers has decades of cookies behind it.</p> <img src="https://cliffle.com/food/oatmeal-lace-cookies/lace-cookies.webp" width=1024 height=768 alt="Golden brown very thin cookies with holes in them"> Tue, 09 Mar 2021 00:00:00 +0000 https://cliffle.com/food/sorghum-gingersnaps/ https://cliffle.com/food/sorghum-gingersnaps/ <p>These cookies come out small, which is good, because it’s hard to stop eating them. That’s why I only bake half a batch at a time.</p> <p>Sorghum syrup may not be a thing where you live. You can try substituting molasses or date syrup. (I haven’t tried either.)</p> <p>This recipe is derived from several online recipes, with a particular influence from <a href="https://ofbatteranddough.com/mini-sorghum-ginger-cookies-chewy-gingersnaps">Rebecca Blackwell’s recipe</a>.</p> Sun, 07 Mar 2021 00:00:00 +0000 https://cliffle.com/food/boosted-cinnamon-rolls/ https://cliffle.com/food/boosted-cinnamon-rolls/ <p>This is based on <a href="https://www.kingarthurbaking.com/recipes/soft-cinnamon-rolls-recipe">this a recipe from King Arthur Flour</a>, but has been optimized for how I personally prefer cinnamon rolls: with citrusy frosting and a lot of cinnamon taste.</p> <p>It turns out that adding a carefully chosen amount of freshly ground black pepper to cinnamon causes it to taste more cinnamony when it comes out of the oven. Too much pepper, and it tastes like pepper (which I also like, but that’s not the goal here).</p> Sun, 07 Mar 2021 00:00:00 +0000 https://cliffle.com/food/citrus-cream-cheese-frosting/ https://cliffle.com/food/citrus-cream-cheese-frosting/ <p>This frosting is what I prefer on cinnamon rolls. It comes out flavorful and sweet, but not <em>too</em> sweet – and the salt helps to bring back some of the complexity of the citrus that would otherwise be lost to the sugar.</p> Sun, 07 Mar 2021 00:00:00 +0000 https://cliffle.com/food/collard-greens/ https://cliffle.com/food/collard-greens/ <p>I like my collard greens soft but not mushy, with a mix of salty and sour flavors and not too much sugar. You can achieve this by braising, but I use an electric pressure cooker – it’s much faster. This is derived from a bunch of Internet recipes and then tuned to my taste.</p> <p>This recipe can be doubled, but you may run out of space to steam the greens. You can do it in batches since they’ll shrink a little.</p> Sun, 07 Mar 2021 00:00:00 +0000 https://cliffle.com/food/granola/ https://cliffle.com/food/granola/ <p>Oats have been easier to get than good granola recently, so I’ve taken to making my own. This is remixed from a friend’s recipe.</p> Sun, 07 Mar 2021 00:00:00 +0000 https://cliffle.com/food/saag-whatever/ https://cliffle.com/food/saag-whatever/ <p>I’m referring to this as “saag whatever” because whether to add mixins – such as paneer, potatoes, or vegetables – is up to you. The recipe doesn’t particularly care as long as your mixins don’t add a bunch of liquid. Boiling or roasting some small potatoes in advance, or alongside, makes for an easy saag aloo.</p> <p>This calls for frozen spinach as a hack to reduce prep time and keep the result green. (Fresh spinach can go gray-brown during cooking if you’re not careful.)</p> <p>This is adapted from a friend’s unwritten recipe.</p> Mon, 07 Sep 2020 00:00:00 +0000 https://cliffle.com/blog/rust-first-mover/ https://cliffle.com/blog/rust-first-mover/ <p><em>(I’ve updated this pattern, since a lot has changed since 2020. The recommendations here should be ready for the Rust 2024 edition, and are closer to correct in a post-pointer-provenance world.)</em></p> <p>Here’s another useful Rust pattern. Like the <a href="/blog/rust-typestate/">Typestate Pattern</a> before it, I wrote this because I haven’t seen the sort of obsessively nerdy writeup that I wanted to read. And, as with the Typestate Pattern, I didn’t invent this — I’m merely documenting and generalizing it.</p> Fri, 24 Jan 2020 00:00:00 +0000 https://cliffle.com/blog/accessibility-updates/ https://cliffle.com/blog/accessibility-updates/ <p>Since it looks like some folks have been <em>actually reading my blog,</em> I’ve made a pass over the site, looking for accessibility problems. I have increased visual contrast and made links within articles slightly more obvious. The comments in code samples are still under the <a href="https://www.w3.org/WAI/standards-guidelines/wcag/">WCAG</a> recommended constrast level, but they’re generated by a third party syntax highlighting library, so fixing them is more involved.</p> <p>Please <a href="/contact/">let me know</a> if you have any difficulty using the site!</p> Sun, 05 Jan 2020 00:00:00 +0000 https://cliffle.com/p/dangerust/6/ https://cliffle.com/p/dangerust/6/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In this series so far, we’ve taken a C program and converted it into a faster, smaller, and reasonably robust Rust program. The Rust program is a recognizable descendant of the C program, and that was deliberate: my goal was to compare and contrast the two languages for optimized code.</p> <p>In this bonus section, I’ll walk through how we’d write the program from scratch in Rust. In particular, I’m going to rely on compiler auto-vectorization to produce a program that is shorter, simpler, portable, and significantly faster… and without any <code>unsafe</code>.</p> <p>Can it be? Read on…</p> Sat, 14 Dec 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/5/ https://cliffle.com/p/dangerust/5/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In <a href="https://cliffle.com/p/dangerust/4/">part 4</a> we took the <code>unsafe</code> code that deals with treating arrays of <code>f64</code> as arrays of vectors, and we corralled it into a safe API.</p> <p>In this installment, we’ll look at the remaining reasons why <code>advance</code> is an <code>unsafe fn</code>, and make it safe — not by <em>removing</em> all the <code>unsafe</code>, but by narrowing it down.</p> <p>This one’s a doozy — the remaining changes to <code>advance</code> are hard to separate, so I’ve packed them all into one section. Now is probably a good time to refill your coffee.</p> Wed, 11 Dec 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/4/ https://cliffle.com/p/dangerust/4/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In <a href="https://cliffle.com/p/dangerust/3/">part 3</a> we found that our use of uninitialized memory was a premature optimization that didn’t actually improve performance. This left us with only one remaining <code>unsafe</code> function, but, boy, is it a doozy.</p> <p>In this part, I’ll begin the process of corralling its <code>unsafe</code> optimizations into more clearly safe code, by replacing arbitrary pointer casting with a lightweight abstraction.</p> Mon, 09 Dec 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/3/ https://cliffle.com/p/dangerust/3/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In <a href="https://cliffle.com/p/dangerust/2/">part 2</a> we introduced Rust references, and this was enough to convert one of our inner functions into safe Rust.</p> <p>The others are still <code>unsafe</code>. There are several reasons for this. In this, the briefest of sections, we’ll tackle the easiest one: deliberate use of uninitialized memory.</p> Mon, 02 Dec 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/0/ https://cliffle.com/p/dangerust/0/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>I think Rust is a great tool for C programmers to have in their arsenals. But Rust tutorials tend to start with higher-level concepts, focusing on what can be done with safe code and treating <code>unsafe</code> code as the exception. This can be alienating to us hardcore low-level programmers. It’s like offering a course on blacksmithing but then spending all your time talking about how to clean chain mail — useful, maybe, but…didn’t you skip some important steps?</p> <p>In this series, I’m trying something different. Let’s take a grungy, optimized, pointer-type-punning, SSE-using, heap-eschewing, warning-disabling C program and look at how we could create the same program in Rust. And I do mean the <em>same</em> program, without bounds checks or seatbelts, in all its unsafe glory.</p> <p>Then, let’s evolve it, by applying the features that Rust adds to C. We’ll study the advantages and disadvantages at each step, thinking about how it affects both the code and our experience of <em>working on</em> the code. And as a ground rule: we won’t let any step lose performance.</p> <p>In the end, we’ll wind up with a 95%-safe Rust program, immune to crashes and segfaults and buffer overflows, that’s slightly <em>faster</em> than the original C program implementing the exact same algorithm.</p> <h1 id="what-this-isn-t">What this isn’t</h1> <p>This isn’t a complete course on Rust — it’s meant to complement other resources for learning the language. Read <a href="https://doc.rust-lang.org/book/">the Rust book</a> to learn what Rust’s features <em>are</em>; read this to put them in <em>context</em> with the low-level programming you already understand.</p> <p>Experienced programmers can probably get a taste of Rust from this series even if you don’t speak the language. If what I have to say piques your interest, it’s time to go read the book.</p> <h1 id="interested">Interested?</h1> <p>Head to section one: <a href="../1/">You can’t write C in just any ol’ language.</a></p> Mon, 02 Dec 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/2/ https://cliffle.com/p/dangerust/2/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In <a href="https://cliffle.com/p/dangerust/1/">the first part of this tutorial</a> we took an optimized C program and translated it to an equivalent Rust program, complete with all the unsafe weirdness of the original: uninitialized variables, pointer casting and arithmetic, etc.</p> <p>In this section, we’ll begin using Rust’s features to make the program incrementally more robust, while keeping performance unchanged.</p> <p>Specifically, we’ll begin by introducing <em>references.</em></p> Sun, 24 Nov 2019 00:00:00 +0000 https://cliffle.com/p/dangerust/1/ https://cliffle.com/p/dangerust/1/ <p>(<a href="https://cliffle.com/p/dangerust/">Series Overview</a>)</p> <p>In this part of the series, we’ll take a grungy optimized C program and translate it, fairly literally, into a grungy optimized unsafe Rust program. It’ll get the same results, with the same performance, as the original.</p> Fri, 07 Jun 2019 00:00:00 +0000 https://cliffle.com/blog/bare-metal-wasm/ https://cliffle.com/blog/bare-metal-wasm/ <p>I’ve been studying <a href="https://webassembly.org/">WebAssembly</a> recently, which has included porting some of my <a href="https://github.com/cbiffle/m4vga-rs/">m4vga graphics demos</a>. I started with the <a href="https://rustwasm.github.io/docs/book/game-of-life/introduction.html">Rust and WebAssembly Tutorial</a>, which has you use fancy tools like <code>wasm-pack</code>, <code>wasm-bindgen</code>, <code>webpack</code>, and <code>npm</code> to produce a Rust-powered webpage.</p> <p>And that’s great! But I want to know how things actually work, and those tools put a <em>lot</em> of code between me and the machine.</p> <p>In this post, I’ll show how to create a simple web graphics demo using <em>none</em> of those tools — just hand-written Rust, JavaScript, and HTML. There will be no libraries between our code and the platform. It’s the web equivalent of <a href="https://en.wikipedia.org/wiki/Bare_machine">bare metal programming</a>!</p> <p>The resulting WebAssembly module will be <strong>less than 300 bytes.</strong> That’s about the same size as the previous paragraph.</p> Wed, 05 Jun 2019 00:00:00 +0000 https://cliffle.com/blog/rust-typestate/ https://cliffle.com/blog/rust-typestate/ <p>The <em>typestate pattern</em> is an API design pattern that encodes information about an object’s run-time <em>state</em> in its compile-time <em>type</em>. In particular, an API using the typestate pattern will have:</p> <ol> <li> <p>Operations on an object (such as methods or functions) that are only available when the object is in certain states,</p> </li> <li> <p>A way of encoding these states at the type level, such that attempts to use the operations in the wrong state fail to compile,</p> </li> <li> <p>State transition operations (methods or functions) that <em>change</em> the type-level state of objects in addition to, or instead of, changing run-time dynamic state, such that the operations in the previous state are no longer possible.</p> </li> </ol> <p>This is useful because:</p> <ul> <li>It moves certain types of errors from run-time to compile-time, giving programmers faster feedback.</li> <li>It interacts nicely with IDEs, which can avoid suggesting operations that are illegal in a certain state.</li> <li>It can eliminate run-time checks, making code faster/smaller.</li> </ul> <p>This pattern is so easy in Rust that it’s almost <em>obvious</em>, to the point that you may have already written code that uses it, perhaps without realizing it. Interestingly, it’s <em>very difficult to implement</em> in most other programming languages — most of them fail to satisfy items number 2 and/or 3 above.</p> <p>I haven’t seen a detailed examination of the nuances of this pattern, so here’s my contribution.</p> Sat, 23 Feb 2019 00:00:00 +0000 https://cliffle.com/blog/m4vga-in-rust/ https://cliffle.com/blog/m4vga-in-rust/ <p>If this isn’t your first time visiting my blog, you may recall that I’ve spent the past several years building an <a href="/tags/glitch-demo/">elaborate microcontroller graphics demo</a> using C++.</p> <p>Over the past few months, I’ve been rewriting it — in <a href="https://rust-lang.org/">Rust</a>.</p> <p>This is an interesting test case for Rust, because we’re very much in C/C++’s home court here: the demo runs on the bare metal, without an operating system, and is very sensitive to both CPU timing and memory usage.</p> <p>The results so far? <strong>The Rust implementation is simpler, shorter (in lines of code), faster, and smaller (in bytes of Flash)</strong> than my heavily-optimized C++ version — and because it’s <strong>almost entirely safe code,</strong> several types of bugs that I fought regularly, such as race conditions and dangling pointers, are now caught <em>by the compiler.</em></p> <p>It’s fantastic. Read on for my notes on the process.</p> Thu, 07 Feb 2019 00:00:00 +0000 https://cliffle.com/blog/prefer-rust/ https://cliffle.com/blog/prefer-rust/ <p><em>This is a position paper that I originally circulated inside the firmware community at <a href="https://x.company/">X</a>. I’ve gotten requests for a public link, so I’ve cleaned it up and posted it here. This is, obviously, my personal opinion. Please read the whole thing before sending me angry emails.</em></p> <p><strong>tl;dr:</strong> C/C++ have enough design flaws, and the alternative tools are in good enough shape, that I do not recommend using C/C++ for new development except in extenuating circumstances. In situations where you actually need the power of C/C++, use <a href="https://rust-lang.org/">Rust</a> instead. In other situations, you shouldn’t have been using C/C++ anyway — use nearly anything else.</p> Tue, 16 Jun 2015 00:00:00 +0000 https://cliffle.com/blog/racing-the-beam/ https://cliffle.com/blog/racing-the-beam/ <p><em>This post is the fourth in a <a href="/tags/glitch-demo/">series</a> looking at the design and implementation of my <a href="/tags/glitch-demo/">Glitch</a> demo and the <a href="https://github.com/cbiffle/m4vgalib/">m4vgalib</a> code that powers it.</em></p> <p>In <a href="/article/2015/06/11/matrix/">part three</a> we took a deep dive into the STM32F407’s internal architecture, and looked at how to <em>sustain</em> the high-bandwidth flow that we set up in <a href="/article/2015/06/06/pushing-pixels/">part two</a>.</p> <p>Great, so we have pixels streaming from RAM at a predictable rate — but we don’t have enough RAM to hold an entire frame’s worth of 8-bit pixels! What to do?</p> <p>Why, we generate the pixels as they’re needed, of course! But that’s easier said than done: generate them <em>how</em>, and <em>from what?</em></p> <p>In this article, I’ll take a look at <a href="https://github.com/cbiffle/m4vgalib/">m4vgalib</a>’s answer to these questions: the <em>rasterizer</em>.</p> Wed, 10 Jun 2015 00:00:00 +0000 https://cliffle.com/blog/glitch-in-the-matrix/ https://cliffle.com/blog/glitch-in-the-matrix/ <p><em>This post is the third in a <a href="/tags/glitch-demo/">series</a> looking at the design and implementation of my <a href="/tags/glitch-demo/">Glitch</a> demo and the <a href="https://github.com/cbiffle/m4vgalib/">m4vgalib</a> code that powers it.</em></p> <p>In <a href="/blog/pushing-pixels/">part two</a>, I showed a fast way to push pixels out of an STM32F407 by getting the DMA controller to run at top speed. I described the mode as follows:</p> <blockquote> <p>It just runs full-tilt, restricted only by the speed of the “memory” <em>[or memory-mapped peripheral]</em> at either side…</p> </blockquote> <p>But there’s a weakness in this approach, which can introduce jitter and hurt your video quality. I hinted at it in a footnote:</p> <blockquote> <p>…and traffic on the AHB matrix, which is very important — I’ll come back to this.</p> </blockquote> <p>Quite a bit of <a href="https://github.com/cbiffle/m4vgalib/">m4vgalib</a>’s design is dedicated to coordinating matrix traffic, while imposing few restrictions on the application. In this article, with a minimum of movie puns, I’ll explain what that that means and how I achieved it.</p> Sat, 06 Jun 2015 00:00:00 +0000 https://cliffle.com/blog/pushing-pixels/ https://cliffle.com/blog/pushing-pixels/ <p><em>This post is the second in a <a href="/tags/glitch-demo/">series</a> looking at the design and implementation of my <a href="/tags/glitch-demo/">Glitch</a> demo and the <a href="https://github.com/cbiffle/m4vgalib/">m4vgalib</a> code that powers it.</em></p> <p><strong>Updated 2015-06-10</strong>: clarifications from reader feedback.</p> <p>For the first <em>technical</em> part in the series, I’d like to start from the very end: getting the finished pixels out of the microprocessor and off to a display.</p> <p>Why start from the end? Because it’s where I started in my initial experiments, and because my decisions here had <em>significant effects</em> on the shape of the rest of the system.</p> Fri, 05 Jun 2015 00:00:00 +0000 https://cliffle.com/blog/introducing-glitch/ https://cliffle.com/blog/introducing-glitch/ <p>Hey, look! I made a little graphics demo!</p> Sat, 09 May 2015 00:00:00 +0000 https://cliffle.com/blog/hakyll/ https://cliffle.com/blog/hakyll/ <p><strong>Update from four years later:</strong> I’ve switched away from Hakyll. These notes are here for their historical value only.</p> <p>I used to manage this site with <a href="http://jekyllrb.com/">Jekyll</a>. I’ve now switched to <a href="http://jaspervdj.be/hakyll/">Hakyll</a>. Here’s my reasoning and some notes on how it went.</p> Tue, 18 Jun 2013 00:00:00 +0000 https://cliffle.com/blog/loon/ https://cliffle.com/blog/loon/ <p>While I’ve been blogging about my personal projects off and on, I’ve been awfully quiet about my day job. Now I can tell you why.</p> Sat, 26 Jan 2013 00:00:00 +0000 https://cliffle.com/blog/publicfile-patches/ https://cliffle.com/blog/publicfile-patches/ <p>While <a href="http://cr.yp.to/">djb</a> is perhaps best known for writing <a href="http://cr.yp.to/qmail.html">qmail</a>, he also wrote a web server, <a href="http://publicfile.org">publicfile</a>. Like his other software, publicfile is simple and robust. I use it to serve this site, among <a href="https://cliffle.com/colophon/">other software</a>.</p> <p>Characteristically for djb, publicfile is pretty minimal out of the box. Here are a few patches I applied to the source to make my server faster, more flexible, and easier to use.</p> Sun, 20 Jan 2013 00:00:00 +0000 https://cliffle.com/blog/data-on-attacks/ https://cliffle.com/blog/data-on-attacks/ <p>I try to maintain a reasonably secure webserver.</p> <p>A webserver is a computer, connected to the public internet, that does things (serves pages, etc.) whenever anyone asks it to. This makes it an easy thing to attack: the first step toward attacking a computer is usually getting it to do your bidding, and a webserver does your bidding every time you click a link.</p> <p>My system logs show that I get attacked several times a day, like (I imagine) most computers on the Internet. Fortunately, most attacks bounce off — not because I have some magic security-foo, but rather because <a href="https://cliffle.com/colophon/">the software I’m using</a> — specifically <a href="http://publicfile.org/">publicfile</a> — doesn’t work the way the attackers expect it to.</p> <p>While I am not so naive or foolish as to say that my server is “secure” — I’m sure it has some exploitable hole, and it runs in a distant facility that probably forgets to lock the doors sometimes — these attacks are of mostly academic interest.</p> <p>Here’s some data I’ve collected from the past month or so of attacks. I figure this might help someone else detect or prevent an attack in the future.</p> Sun, 20 Jan 2013 00:00:00 +0000 https://cliffle.com/blog/data-on-attacks/ssh-usernames/ https://cliffle.com/blog/data-on-attacks/ssh-usernames/ <p>This is broken out from the longer article, <a href="https://cliffle.com/blog/data-on-attacks/">Attacks On My Server: The Data</a>.</p> <p>This data covers only the period between 2012-12-26 22:41 and 2013-01-21 17:05, TAI (which is roughly UTC for our purposes).</p> <p>Points of interest:</p> <ul> <li>28,889 unsuccessful attack attempts. (I’m assuming that any <em>successful</em> attacks have covered their tracks and are not represented here.)</li> <li>2,185 unique usernames were tried.</li> <li>Frequency falls off exponentially with a very long tail.</li> <li>The list of names being used has some overlap with the Ruby <code>Faker</code> module, but the overlap isn’t perfect — suggesting that the two might have used similar sources, but that the attackers are probably not using <code>Faker</code>.</li> </ul> <table><thead><tr><th style="text-align: right">Count</th><th>Name</th></tr></thead><tbody> <tr><td style="text-align: right">16471</td><td>root</td></tr> <tr><td style="text-align: right">738</td><td>apache</td></tr> <tr><td style="text-align: right">537</td><td>admin</td></tr> <tr><td style="text-align: right">396</td><td>test</td></tr> <tr><td style="text-align: right">346</td><td>backup</td></tr> <tr><td style="text-align: right">326</td><td>nagios</td></tr> <tr><td style="text-align: right">293</td><td>testuser</td></tr> <tr><td style="text-align: right">289</td><td>teamspeak3</td></tr> <tr><td style="text-align: right">211</td><td>user</td></tr> <tr><td style="text-align: right">211</td><td>oracle</td></tr> <tr><td style="text-align: right">204</td><td>ftp</td></tr> <tr><td style="text-align: right">200</td><td>www</td></tr> <tr><td style="text-align: right">194</td><td>webadmin</td></tr> <tr><td style="text-align: right">184</td><td>ftptest</td></tr> <tr><td style="text-align: right">182</td><td>info</td></tr> <tr><td style="text-align: right">179</td><td>mysql</td></tr> <tr><td style="text-align: right">169</td><td>ftpuser</td></tr> <tr><td style="text-align: right">165</td><td>testftp</td></tr> <tr><td style="text-align: right">164</td><td>web</td></tr> <tr><td style="text-align: right">158</td><td>ts3</td></tr> <tr><td style="text-align: right">152</td><td>userftp</td></tr> <tr><td style="text-align: right">147</td><td>svn</td></tr> <tr><td style="text-align: right">128</td><td>www-data</td></tr> <tr><td style="text-align: right">116</td><td>test1</td></tr> <tr><td style="text-align: right">111</td><td>testing</td></tr> <tr><td style="text-align: right">109</td><td>tester</td></tr> <tr><td style="text-align: right">108</td><td>deploy</td></tr> <tr><td style="text-align: right">100</td><td>test2</td></tr> <tr><td style="text-align: right">100</td><td>test123</td></tr> <tr><td style="text-align: right">97</td><td>test4</td></tr> <tr><td style="text-align: right">97</td><td>test3</td></tr> <tr><td style="text-align: right">86</td><td>support</td></tr> <tr><td style="text-align: right">62</td><td>teamspeak</td></tr> <tr><td style="text-align: right">53</td><td>guest</td></tr> <tr><td style="text-align: right">52</td><td>bin</td></tr> <tr><td style="text-align: right">31</td><td>ts</td></tr> <tr><td style="text-align: right">28</td><td>postgres</td></tr> <tr><td style="text-align: right">26</td><td>nick</td></tr> <tr><td style="text-align: right">26</td><td>michael</td></tr> <tr><td style="text-align: right">26</td><td>kubota</td></tr> <tr><td style="text-align: right">24</td><td>saito</td></tr> <tr><td style="text-align: right">23</td><td>webmaster</td></tr> <tr><td style="text-align: right">23</td><td>sales</td></tr> <tr><td style="text-align: right">22</td><td>users</td></tr> <tr><td style="text-align: right">22</td><td>git</td></tr> <tr><td style="text-align: right">22</td><td>alex</td></tr> <tr><td style="text-align: right">21</td><td>clamav</td></tr> <tr><td style="text-align: right">21</td><td>Admin</td></tr> <tr><td style="text-align: right">20</td><td>Test</td></tr> <tr><td style="text-align: right">20</td><td>shit</td></tr> <tr><td style="text-align: right">20</td><td>office</td></tr> <tr><td style="text-align: right">20</td><td>nobuta</td></tr> <tr><td style="text-align: right">20</td><td>adam</td></tr> <tr><td style="text-align: right">19</td><td>bsnl</td></tr> <tr><td style="text-align: right">18</td><td>spam</td></tr> <tr><td style="text-align: right">18</td><td>mike</td></tr> <tr><td style="text-align: right">18</td><td>john</td></tr> <tr><td style="text-align: right">17</td><td>miniroot</td></tr> <tr><td style="text-align: right">17</td><td>informix</td></tr> <tr><td style="text-align: right">16</td><td>webuser</td></tr> <tr><td style="text-align: right">16</td><td>ubuntu</td></tr> <tr><td style="text-align: right">16</td><td>temp</td></tr> <tr><td style="text-align: right">16</td><td>sysadm</td></tr> <tr><td style="text-align: right">16</td><td>jordan</td></tr> <tr><td style="text-align: right">16</td><td>gast</td></tr> <tr><td style="text-align: right">16</td><td>arun</td></tr> <tr><td style="text-align: right">15</td><td>toto</td></tr> <tr><td style="text-align: right">15</td><td>ram</td></tr> <tr><td style="text-align: right">15</td><td>dan</td></tr> <tr><td style="text-align: right">15</td><td>daemon</td></tr> <tr><td style="text-align: right">15</td><td>core</td></tr> <tr><td style="text-align: right">14</td><td>shop</td></tr> <tr><td style="text-align: right">14</td><td>pvm</td></tr> <tr><td style="text-align: right">14</td><td>jack</td></tr> <tr><td style="text-align: right">14</td><td>initech</td></tr> <tr><td style="text-align: right">14</td><td>eqidemo</td></tr> <tr><td style="text-align: right">14</td><td>donald</td></tr> <tr><td style="text-align: right">14</td><td>cvsadm</td></tr> <tr><td style="text-align: right">13</td><td>xelloss</td></tr> <tr><td style="text-align: right">13</td><td>tina</td></tr> <tr><td style="text-align: right">13</td><td>scott</td></tr> <tr><td style="text-align: right">13</td><td>ranger</td></tr> <tr><td style="text-align: right">13</td><td>ramesh</td></tr> <tr><td style="text-align: right">13</td><td>production</td></tr> <tr><td style="text-align: right">13</td><td>allan</td></tr> <tr><td style="text-align: right">12</td><td>zhaowei</td></tr> <tr><td style="text-align: right">12</td><td>uploader</td></tr> <tr><td style="text-align: right">12</td><td>snoopy</td></tr> <tr><td style="text-align: right">12</td><td>sir</td></tr> <tr><td style="text-align: right">12</td><td>shadow</td></tr> <tr><td style="text-align: right">12</td><td>pgsql</td></tr> <tr><td style="text-align: right">12</td><td>penjonat</td></tr> <tr><td style="text-align: right">12</td><td>mustang</td></tr> <tr><td style="text-align: right">12</td><td>maggie</td></tr> <tr><td style="text-align: right">12</td><td>letmein</td></tr> <tr><td style="text-align: right">12</td><td>johnchow</td></tr> <tr><td style="text-align: right">12</td><td>hockey</td></tr> <tr><td style="text-align: right">12</td><td>harley</td></tr> <tr><td style="text-align: right">12</td><td>goscie</td></tr> <tr><td style="text-align: right">12</td><td>gosc2</td></tr> <tr><td style="text-align: right">12</td><td>gosc1</td></tr> <tr><td style="text-align: right">12</td><td>gosc</td></tr> <tr><td style="text-align: right">12</td><td>geeko</td></tr> <tr><td style="text-align: right">12</td><td>ejin</td></tr> <tr><td style="text-align: right">12</td><td>dragon</td></tr> <tr><td style="text-align: right">12</td><td>daan</td></tr> <tr><td style="text-align: right">12</td><td>buster</td></tr> <tr><td style="text-align: right">12</td><td>baseball</td></tr> <tr><td style="text-align: right">12</td><td>anne</td></tr> <tr><td style="text-align: right">12</td><td>angela</td></tr> <tr><td style="text-align: right">11</td><td>visitor</td></tr> <tr><td style="text-align: right">11</td><td>student</td></tr> <tr><td style="text-align: right">11</td><td>fred</td></tr> <tr><td style="text-align: right">11</td><td>bill</td></tr> <tr><td style="text-align: right">11</td><td>anurag</td></tr> <tr><td style="text-align: right">10</td><td>webalizer</td></tr> <tr><td style="text-align: right">10</td><td>username</td></tr> <tr><td style="text-align: right">10</td><td>tinydns</td></tr> <tr><td style="text-align: right">10</td><td>techsupport</td></tr> <tr><td style="text-align: right">10</td><td>steve</td></tr> <tr><td style="text-align: right">10</td><td>miniadmin</td></tr> <tr><td style="text-align: right">10</td><td>minecraft</td></tr> <tr><td style="text-align: right">10</td><td>jon</td></tr> <tr><td style="text-align: right">10</td><td>dnslog</td></tr> <tr><td style="text-align: right">10</td><td>dnscache</td></tr> <tr><td style="text-align: right">10</td><td>daily</td></tr> <tr><td style="text-align: right">10</td><td>cstrike</td></tr> <tr><td style="text-align: right">10</td><td>confluence</td></tr> <tr><td style="text-align: right">10</td><td>axfrdns</td></tr> <tr><td style="text-align: right">10</td><td>albert</td></tr> <tr><td style="text-align: right">9</td><td>upload</td></tr> <tr><td style="text-align: right">9</td><td>tomcat</td></tr> <tr><td style="text-align: right">9</td><td>tim</td></tr> <tr><td style="text-align: right">9</td><td>news</td></tr> <tr><td style="text-align: right">9</td><td>loach</td></tr> <tr><td style="text-align: right">9</td><td>jason</td></tr> <tr><td style="text-align: right">9</td><td>chun</td></tr> <tr><td style="text-align: right">8</td><td>user0</td></tr> <tr><td style="text-align: right">8</td><td>spool</td></tr> <tr><td style="text-align: right">8</td><td>ricardo</td></tr> <tr><td style="text-align: right">8</td><td>raqbackup</td></tr> <tr><td style="text-align: right">8</td><td>packages</td></tr> <tr><td style="text-align: right">8</td><td>marco</td></tr> <tr><td style="text-align: right">8</td><td>lp</td></tr> <tr><td style="text-align: right">8</td><td>joel</td></tr> <tr><td style="text-align: right">8</td><td>games</td></tr> <tr><td style="text-align: right">8</td><td>david</td></tr> <tr><td style="text-align: right">8</td><td>customer</td></tr> <tr><td style="text-align: right">8</td><td>calendar</td></tr> <tr><td style="text-align: right">8</td><td>boblguser</td></tr> <tr><td style="text-align: right">8</td><td>administrator</td></tr> <tr><td style="text-align: right">8</td><td>abuse</td></tr> <tr><td style="text-align: right">8</td><td>____</td></tr> <tr><td style="text-align: right">7</td><td>skyblue</td></tr> <tr><td style="text-align: right">7</td><td>robert</td></tr> <tr><td style="text-align: right">7</td><td>rob</td></tr> <tr><td style="text-align: right">7</td><td>prince</td></tr> <tr><td style="text-align: right">7</td><td>paul</td></tr> <tr><td style="text-align: right">7</td><td>newsletter</td></tr> <tr><td style="text-align: right">7</td><td>mwcdown</td></tr> <tr><td style="text-align: right">7</td><td>muan16</td></tr> <tr><td style="text-align: right">7</td><td>mobyudal</td></tr> <tr><td style="text-align: right">7</td><td>media</td></tr> <tr><td style="text-align: right">7</td><td>jingyun</td></tr> <tr><td style="text-align: right">7</td><td>ishinan</td></tr> <tr><td style="text-align: right">7</td><td>httpd</td></tr> <tr><td style="text-align: right">7</td><td>honglim</td></tr> <tr><td style="text-align: right">7</td><td>demo</td></tr> <tr><td style="text-align: right">7</td><td>dbird</td></tr> <tr><td style="text-align: right">7</td><td>cylin</td></tr> <tr><td style="text-align: right">7</td><td>cathy</td></tr> <tr><td style="text-align: right">7</td><td>bacula</td></tr> <tr><td style="text-align: right">7</td><td>ash</td></tr> <tr><td style="text-align: right">6</td><td>ts3server</td></tr> <tr><td style="text-align: right">6</td><td>tristan</td></tr> <tr><td style="text-align: right">6</td><td>rsync</td></tr> <tr><td style="text-align: right">6</td><td>ronaldo</td></tr> <tr><td style="text-align: right">6</td><td>richard</td></tr> <tr><td style="text-align: right">6</td><td>ray</td></tr> <tr><td style="text-align: right">6</td><td>postmaster</td></tr> <tr><td style="text-align: right">6</td><td>paypal</td></tr> <tr><td style="text-align: right">6</td><td>nobody</td></tr> <tr><td style="text-align: right">6</td><td>london</td></tr> <tr><td style="text-align: right">6</td><td>linux</td></tr> <tr><td style="text-align: right">6</td><td>library</td></tr> <tr><td style="text-align: right">6</td><td>lee</td></tr> <tr><td style="text-align: right">6</td><td>lars</td></tr> <tr><td style="text-align: right">6</td><td>junior</td></tr> <tr><td style="text-align: right">6</td><td>joseph</td></tr> <tr><td style="text-align: right">6</td><td>jeff</td></tr> <tr><td style="text-align: right">6</td><td>george</td></tr> <tr><td style="text-align: right">6</td><td>fucker</td></tr> <tr><td style="text-align: right">6</td><td>fax</td></tr> <tr><td style="text-align: right">6</td><td>cyrus</td></tr> <tr><td style="text-align: right">6</td><td>cloud</td></tr> <tr><td style="text-align: right">6</td><td>cactiuser</td></tr> <tr><td style="text-align: right">6</td><td>cacti</td></tr> <tr><td style="text-align: right">6</td><td>angel</td></tr> <tr><td style="text-align: right">6</td><td>andy</td></tr> <tr><td style="text-align: right">6</td><td>amanda</td></tr> <tr><td style="text-align: right">5</td><td>trash</td></tr> <tr><td style="text-align: right">5</td><td>terry</td></tr> <tr><td style="text-align: right">5</td><td>sybase</td></tr> <tr><td style="text-align: right">5</td><td>smmsp</td></tr> <tr><td style="text-align: right">5</td><td>samuel</td></tr> <tr><td style="text-align: right">5</td><td>operator</td></tr> <tr><td style="text-align: right">5</td><td>new</td></tr> <tr><td style="text-align: right">5</td><td>natalia</td></tr> <tr><td style="text-align: right">5</td><td>max</td></tr> <tr><td style="text-align: right">5</td><td>mawan</td></tr> <tr><td style="text-align: right">5</td><td>man</td></tr> <tr><td style="text-align: right">5</td><td>mail</td></tr> <tr><td style="text-align: right">5</td><td>luis</td></tr> <tr><td style="text-align: right">5</td><td>lab</td></tr> <tr><td style="text-align: right">5</td><td>jabber</td></tr> <tr><td style="text-align: right">5</td><td>icinga</td></tr> <tr><td style="text-align: right">5</td><td>gnats</td></tr> <tr><td style="text-align: right">5</td><td>gitolite</td></tr> <tr><td style="text-align: right">5</td><td>frank</td></tr> <tr><td style="text-align: right">5</td><td>dino</td></tr> <tr><td style="text-align: right">5</td><td>developer</td></tr> <tr><td style="text-align: right">5</td><td>adm</td></tr> <tr><td style="text-align: right">4</td><td>zt</td></tr> <tr><td style="text-align: right">4</td><td>xerox</td></tr> <tr><td style="text-align: right">4</td><td>winston</td></tr> <tr><td style="text-align: right">4</td><td>websites</td></tr> <tr><td style="text-align: right">4</td><td>valentine</td></tr> <tr><td style="text-align: right">4</td><td>uucp</td></tr> <tr><td style="text-align: right">4</td><td>user1</td></tr> <tr><td style="text-align: right">4</td><td>tv</td></tr> <tr><td style="text-align: right">4</td><td>ts3_server</td></tr> <tr><td style="text-align: right">4</td><td>tommy</td></tr> <tr><td style="text-align: right">4</td><td>tobias</td></tr> <tr><td style="text-align: right">4</td><td>tech</td></tr> <tr><td style="text-align: right">4</td><td>tatiana</td></tr> <tr><td style="text-align: right">4</td><td>tanya</td></tr> <tr><td style="text-align: right">4</td><td>stephen</td></tr> <tr><td style="text-align: right">4</td><td>stephan</td></tr> <tr><td style="text-align: right">4</td><td>simon</td></tr> <tr><td style="text-align: right">4</td><td>shutdown</td></tr> <tr><td style="text-align: right">4</td><td>show</td></tr> <tr><td style="text-align: right">4</td><td>sergio</td></tr> <tr><td style="text-align: right">4</td><td>selena</td></tr> <tr><td style="text-align: right">4</td><td>sbear</td></tr> <tr><td style="text-align: right">4</td><td>santos</td></tr> <tr><td style="text-align: right">4</td><td>sammy</td></tr> <tr><td style="text-align: right">4</td><td>samba</td></tr> <tr><td style="text-align: right">4</td><td>rootalias</td></tr> <tr><td style="text-align: right">4</td><td>root2</td></tr> <tr><td style="text-align: right">4</td><td>root01</td></tr> <tr><td style="text-align: right">4</td><td>root001</td></tr> <tr><td style="text-align: right">4</td><td>raphael</td></tr> <tr><td style="text-align: right">4</td><td>r00t</td></tr> <tr><td style="text-align: right">4</td><td>purchase</td></tr> <tr><td style="text-align: right">4</td><td>public</td></tr> <tr><td style="text-align: right">4</td><td>pub</td></tr> <tr><td style="text-align: right">4</td><td>prueba</td></tr> <tr><td style="text-align: right">4</td><td>prova</td></tr> <tr><td style="text-align: right">4</td><td>postfix</td></tr> <tr><td style="text-align: right">4</td><td>portal</td></tr> <tr><td style="text-align: right">4</td><td>pop</td></tr> <tr><td style="text-align: right">4</td><td>pictures</td></tr> <tr><td style="text-align: right">4</td><td>photo</td></tr> <tr><td style="text-align: right">4</td><td>peter</td></tr> <tr><td style="text-align: right">4</td><td>oscar</td></tr> <tr><td style="text-align: right">4</td><td>NpC</td></tr> <tr><td style="text-align: right">4</td><td>nigel</td></tr> <tr><td style="text-align: right">4</td><td>nicole</td></tr> <tr><td style="text-align: right">4</td><td>nico</td></tr> <tr><td style="text-align: right">4</td><td>myles</td></tr> <tr><td style="text-align: right">4</td><td>movies</td></tr> <tr><td style="text-align: right">4</td><td>mother</td></tr> <tr><td style="text-align: right">4</td><td>mm</td></tr> <tr><td style="text-align: right">4</td><td>milo</td></tr> <tr><td style="text-align: right">4</td><td>maximo</td></tr> <tr><td style="text-align: right">4</td><td>maxim</td></tr> <tr><td style="text-align: right">4</td><td>maverick</td></tr> <tr><td style="text-align: right">4</td><td>matias</td></tr> <tr><td style="text-align: right">4</td><td>martin</td></tr> <tr><td style="text-align: right">4</td><td>mark</td></tr> <tr><td style="text-align: right">4</td><td>marcus</td></tr> <tr><td style="text-align: right">4</td><td>marcel</td></tr> <tr><td style="text-align: right">4</td><td>mara</td></tr> <tr><td style="text-align: right">4</td><td>manager</td></tr> <tr><td style="text-align: right">4</td><td>logan</td></tr> <tr><td style="text-align: right">4</td><td>list</td></tr> <tr><td style="text-align: right">4</td><td>leonard</td></tr> <tr><td style="text-align: right">4</td><td>kk</td></tr> <tr><td style="text-align: right">4</td><td>kevin</td></tr> <tr><td style="text-align: right">4</td><td>kendall</td></tr> <tr><td style="text-align: right">4</td><td>keanu</td></tr> <tr><td style="text-align: right">4</td><td>kami</td></tr> <tr><td style="text-align: right">4</td><td>julie</td></tr> <tr><td style="text-align: right">4</td><td>juan</td></tr> <tr><td style="text-align: right">4</td><td>johnathon</td></tr> <tr><td style="text-align: right">4</td><td>johan</td></tr> <tr><td style="text-align: right">4</td><td>jj</td></tr> <tr><td style="text-align: right">4</td><td>jetty</td></tr> <tr><td style="text-align: right">4</td><td>jett</td></tr> <tr><td style="text-align: right">4</td><td>jessie</td></tr> <tr><td style="text-align: right">4</td><td>jerry</td></tr> <tr><td style="text-align: right">4</td><td>james</td></tr> <tr><td style="text-align: right">4</td><td>jakob</td></tr> <tr><td style="text-align: right">4</td><td>jairo</td></tr> <tr><td style="text-align: right">4</td><td>jair</td></tr> <tr><td style="text-align: right">4</td><td>info1</td></tr> <tr><td style="text-align: right">4</td><td>ii</td></tr> <tr><td style="text-align: right">4</td><td>i-heart</td></tr> <tr><td style="text-align: right">4</td><td>hub</td></tr> <tr><td style="text-align: right">4</td><td>hh</td></tr> <tr><td style="text-align: right">4</td><td>halt</td></tr> <tr><td style="text-align: right">4</td><td>grace</td></tr> <tr><td style="text-align: right">4</td><td>gopher</td></tr> <tr><td style="text-align: right">4</td><td>gino</td></tr> <tr><td style="text-align: right">4</td><td>gg</td></tr> <tr><td style="text-align: right">4</td><td>gay</td></tr> <tr><td style="text-align: right">4</td><td>gast1</td></tr> <tr><td style="text-align: right">4</td><td>gamer</td></tr> <tr><td style="text-align: right">4</td><td>fuck</td></tr> <tr><td style="text-align: right">4</td><td>flash</td></tr> <tr><td style="text-align: right">4</td><td>ff</td></tr> <tr><td style="text-align: right">4</td><td>elvis</td></tr> <tr><td style="text-align: right">4</td><td>ee</td></tr> <tr><td style="text-align: right">4</td><td>eduardo</td></tr> <tr><td style="text-align: right">4</td><td>diego</td></tr> <tr><td style="text-align: right">4</td><td>die</td></tr> <tr><td style="text-align: right">4</td><td>dick</td></tr> <tr><td style="text-align: right">4</td><td>dd</td></tr> <tr><td style="text-align: right">4</td><td>danny</td></tr> <tr><td style="text-align: right">4</td><td>dandre</td></tr> <tr><td style="text-align: right">4</td><td>cvsuser</td></tr> <tr><td style="text-align: right">4</td><td>cvsroot</td></tr> <tr><td style="text-align: right">4</td><td>cortez</td></tr> <tr><td style="text-align: right">4</td><td>colten</td></tr> <tr><td style="text-align: right">4</td><td>charles</td></tr> <tr><td style="text-align: right">4</td><td>cc</td></tr> <tr><td style="text-align: right">4</td><td>cannon</td></tr> <tr><td style="text-align: right">4</td><td>camren</td></tr> <tr><td style="text-align: right">4</td><td>brian</td></tr> <tr><td style="text-align: right">4</td><td>brett</td></tr> <tr><td style="text-align: right">4</td><td>brad</td></tr> <tr><td style="text-align: right">4</td><td>boby</td></tr> <tr><td style="text-align: right">4</td><td>bob</td></tr> <tr><td style="text-align: right">4</td><td>blaise</td></tr> <tr><td style="text-align: right">4</td><td>bb</td></tr> <tr><td style="text-align: right">4</td><td>barbara</td></tr> <tr><td style="text-align: right">4</td><td>backupuser</td></tr> <tr><td style="text-align: right">4</td><td>baby</td></tr> <tr><td style="text-align: right">4</td><td>aron</td></tr> <tr><td style="text-align: right">4</td><td>anton</td></tr> <tr><td style="text-align: right">4</td><td>andre</td></tr> <tr><td style="text-align: right">4</td><td>america</td></tr> <tr><td style="text-align: right">4</td><td>alonso</td></tr> <tr><td style="text-align: right">4</td><td>alfred</td></tr> <tr><td style="text-align: right">4</td><td>alfonso</td></tr> <tr><td style="text-align: right">4</td><td>aldo</td></tr> <tr><td style="text-align: right">4</td><td>alberto</td></tr> <tr><td style="text-align: right">4</td><td>alan</td></tr> <tr><td style="text-align: right">4</td><td>admins</td></tr> <tr><td style="text-align: right">4</td><td>admin2</td></tr> <tr><td style="text-align: right">4</td><td>admin1</td></tr> <tr><td style="text-align: right">4</td><td>abe</td></tr> <tr><td style="text-align: right">4</td><td>aa</td></tr> 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right">3</td><td>spamd</td></tr> <tr><td style="text-align: right">3</td><td>source</td></tr> <tr><td style="text-align: right">3</td><td>search</td></tr> <tr><td style="text-align: right">3</td><td>sara</td></tr> <tr><td style="text-align: right">3</td><td>rpm</td></tr> <tr><td style="text-align: right">3</td><td>router</td></tr> <tr><td style="text-align: right">3</td><td>root1</td></tr> <tr><td style="text-align: right">3</td><td>root02</td></tr> <tr><td style="text-align: right">3</td><td>redmine</td></tr> <tr><td style="text-align: right">3</td><td>recruit</td></tr> <tr><td style="text-align: right">3</td><td>ralph</td></tr> <tr><td style="text-align: right">3</td><td>project</td></tr> <tr><td style="text-align: right">3</td><td>poczta</td></tr> <tr><td style="text-align: right">3</td><td>PlcmSpIp</td></tr> <tr><td style="text-align: right">3</td><td>oliver</td></tr> <tr><td style="text-align: right">3</td><td>nn</td></tr> <tr><td style="text-align: right">3</td><td>nina</td></tr> 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right">3</td><td>email</td></tr> <tr><td style="text-align: right">3</td><td>download</td></tr> <tr><td style="text-align: right">3</td><td>diskbook</td></tr> <tr><td style="text-align: right">3</td><td>diradmin</td></tr> <tr><td style="text-align: right">3</td><td>db2inst1</td></tr> <tr><td style="text-align: right">3</td><td>confluence1</td></tr> <tr><td style="text-align: right">3</td><td>cloudtest</td></tr> <tr><td style="text-align: right">3</td><td>cindy</td></tr> <tr><td style="text-align: right">3</td><td>brianmac</td></tr> <tr><td style="text-align: right">3</td><td>boss</td></tr> <tr><td style="text-align: right">3</td><td>benjamin</td></tr> <tr><td style="text-align: right">3</td><td>bash</td></tr> <tr><td style="text-align: right">3</td><td>asia</td></tr> <tr><td style="text-align: right">3</td><td>antony</td></tr> <tr><td style="text-align: right">3</td><td>andreas</td></tr> <tr><td style="text-align: right">3</td><td>ana</td></tr> <tr><td style="text-align: right">3</td><td>alumni</td></tr> <tr><td style="text-align: right">3</td><td>allen</td></tr> <tr><td style="text-align: right">3</td><td>admin01</td></tr> <tr><td style="text-align: right">3</td><td>admin001</td></tr> <tr><td style="text-align: right">3</td><td>abcs</td></tr> <tr><td style="text-align: right">3</td><td>aaron</td></tr> <tr><td style="text-align: right">3</td><td>aadriano</td></tr> <tr><td style="text-align: right">2</td><td>zzz</td></tr> <tr><td style="text-align: right">2</td><td>zoor</td></tr> <tr><td style="text-align: right">2</td><td>zoltan</td></tr> <tr><td style="text-align: right">2</td><td>zhouzy</td></tr> <tr><td style="text-align: right">2</td><td>zechariah</td></tr> <tr><td style="text-align: right">2</td><td>zebroc</td></tr> <tr><td style="text-align: right">2</td><td>zane</td></tr> <tr><td style="text-align: right">2</td><td>zaire</td></tr> <tr><td style="text-align: right">2</td><td>zackery</td></tr> <tr><td style="text-align: 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right">2</td><td>tokend</td></tr> <tr><td style="text-align: right">2</td><td>tohi</td></tr> <tr><td style="text-align: right">2</td><td>titus</td></tr> <tr><td style="text-align: right">2</td><td>timothy</td></tr> <tr><td style="text-align: right">2</td><td>thttpd</td></tr> <tr><td style="text-align: right">2</td><td>thereynolds</td></tr> <tr><td style="text-align: right">2</td><td>thaddeus</td></tr> <tr><td style="text-align: right">2</td><td>teszt</td></tr> <tr><td style="text-align: right">2</td><td>testuser1</td></tr> <tr><td style="text-align: right">2</td><td>testuser02</td></tr> <tr><td style="text-align: right">2</td><td>testuser01</td></tr> <tr><td style="text-align: right">2</td><td>testuser001</td></tr> <tr><td style="text-align: right">2</td><td>testtest</td></tr> <tr><td style="text-align: right">2</td><td>testmail</td></tr> <tr><td style="text-align: right">2</td><td>testi</td></tr> <tr><td style="text-align: right">2</td><td>testftps</td></tr> <tr><td style="text-align: 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right">2</td><td>murali</td></tr> <tr><td style="text-align: right">2</td><td>mue</td></tr> <tr><td style="text-align: right">2</td><td>mucha</td></tr> <tr><td style="text-align: right">2</td><td>mpsoc</td></tr> <tr><td style="text-align: right">2</td><td>motoki</td></tr> <tr><td style="text-align: right">2</td><td>moshe</td></tr> <tr><td style="text-align: right">2</td><td>moses</td></tr> <tr><td style="text-align: right">2</td><td>mosa</td></tr> <tr><td style="text-align: right">2</td><td>montse</td></tr> <tr><td style="text-align: right">2</td><td>monitoring</td></tr> <tr><td style="text-align: right">2</td><td>monica</td></tr> <tr><td style="text-align: right">2</td><td>mongodb</td></tr> <tr><td style="text-align: right">2</td><td>monceau</td></tr> <tr><td style="text-align: right">2</td><td>momi</td></tr> <tr><td style="text-align: right">2</td><td>mom</td></tr> <tr><td style="text-align: right">2</td><td>molly</td></tr> <tr><td style="text-align: right">2</td><td>mohammad</td></tr> <tr><td style="text-align: right">2</td><td>mohamed</td></tr> <tr><td style="text-align: right">2</td><td>model</td></tr> <tr><td style="text-align: right">2</td><td>mko</td></tr> <tr><td style="text-align: right">2</td><td>mithun</td></tr> <tr><td style="text-align: right">2</td><td>mitchell</td></tr> <tr><td style="text-align: right">2</td><td>mitch</td></tr> <tr><td style="text-align: right">2</td><td>misael</td></tr> <tr><td style="text-align: right">2</td><td>milton</td></tr> <tr><td style="text-align: right">2</td><td>miles</td></tr> <tr><td style="text-align: right">2</td><td>michela</td></tr> <tr><td style="text-align: right">2</td><td>mesut</td></tr> <tr><td style="text-align: right">2</td><td>messagebus</td></tr> <tr><td style="text-align: right">2</td><td>mercedes</td></tr> <tr><td style="text-align: right">2</td><td>medicina</td></tr> <tr><td style="text-align: right">2</td><td>mecs</td></tr> <tr><td style="text-align: right">2</td><td>mcogoni</td></tr> <tr><td style="text-align: right">2</td><td>maxwell</td></tr> <tr><td style="text-align: right">2</td><td>maximillian</td></tr> <tr><td style="text-align: right">2</td><td>maurizio</td></tr> <tr><td style="text-align: right">2</td><td>mauri</td></tr> <tr><td style="text-align: right">2</td><td>mattias</td></tr> <tr><td style="text-align: right">2</td><td>matthew</td></tr> <tr><td style="text-align: right">2</td><td>matteo</td></tr> <tr><td style="text-align: right">2</td><td>mason</td></tr> <tr><td style="text-align: right">2</td><td>maryt</td></tr> <tr><td style="text-align: right">2</td><td>maryse</td></tr> <tr><td style="text-align: right">2</td><td>martgran</td></tr> <tr><td style="text-align: right">2</td><td>marques</td></tr> <tr><td style="text-align: right">2</td><td>marlon</td></tr> <tr><td style="text-align: right">2</td><td>markus</td></tr> <tr><td style="text-align: right">2</td><td>marketing</td></tr> <tr><td style="text-align: right">2</td><td>marj</td></tr> <tr><td style="text-align: right">2</td><td>mario</td></tr> <tr><td style="text-align: right">2</td><td>marcelo</td></tr> <tr><td style="text-align: right">2</td><td>maravena</td></tr> <tr><td style="text-align: right">2</td><td>manuel</td></tr> <tr><td style="text-align: right">2</td><td>manu</td></tr> <tr><td style="text-align: right">2</td><td>mandrake</td></tr> <tr><td style="text-align: right">2</td><td>mambo</td></tr> <tr><td style="text-align: right">2</td><td>malaki</td></tr> <tr><td style="text-align: right">2</td><td>malakai</td></tr> <tr><td style="text-align: right">2</td><td>malachi</td></tr> <tr><td style="text-align: right">2</td><td>mailuser</td></tr> <tr><td style="text-align: right">2</td><td>mailnull</td></tr> <tr><td style="text-align: right">2</td><td>mailman</td></tr> <tr><td style="text-align: right">2</td><td>mailer</td></tr> <tr><td style="text-align: right">2</td><td>magnus</td></tr> <tr><td style="text-align: right">2</td><td>maciej</td></tr> <tr><td style="text-align: right">2</td><td>lynn1</td></tr> <tr><td style="text-align: right">2</td><td>lynn</td></tr> <tr><td style="text-align: right">2</td><td>lustre</td></tr> <tr><td style="text-align: right">2</td><td>luke</td></tr> <tr><td style="text-align: right">2</td><td>lukas</td></tr> <tr><td style="text-align: right">2</td><td>luisfernando</td></tr> <tr><td style="text-align: right">2</td><td>luciano</td></tr> <tr><td style="text-align: right">2</td><td>luciana</td></tr> <tr><td style="text-align: right">2</td><td>luca</td></tr> <tr><td style="text-align: right">2</td><td>love</td></tr> <tr><td style="text-align: right">2</td><td>louise1</td></tr> <tr><td style="text-align: right">2</td><td>louise</td></tr> <tr><td style="text-align: right">2</td><td>lossin</td></tr> <tr><td style="text-align: right">2</td><td>lorip</td></tr> <tr><td style="text-align: right">2</td><td>localadmin</td></tr> <tr><td style="text-align: right">2</td><td>livro</td></tr> <tr><td style="text-align: right">2</td><td>lincoln</td></tr> <tr><td style="text-align: right">2</td><td>lilka</td></tr> <tr><td style="text-align: right">2</td><td>liarn</td></tr> <tr><td style="text-align: right">2</td><td>lewis</td></tr> <tr><td style="text-align: right">2</td><td>levi</td></tr> <tr><td style="text-align: right">2</td><td>leroy</td></tr> <tr><td style="text-align: right">2</td><td>leonardo</td></tr> <tr><td style="text-align: right">2</td><td>leon</td></tr> <tr><td style="text-align: right">2</td><td>leo</td></tr> <tr><td style="text-align: right">2</td><td>legales</td></tr> <tr><td style="text-align: right">2</td><td>leflem</td></tr> <tr><td style="text-align: right">2</td><td>lcvirtualdomain</td></tr> <tr><td style="text-align: right">2</td><td>lbauli</td></tr> <tr><td style="text-align: right">2</td><td>layne</td></tr> <tr><td style="text-align: right">2</td><td>laura</td></tr> <tr><td style="text-align: right">2</td><td>landyn</td></tr> <tr><td style="text-align: right">2</td><td>landon</td></tr> <tr><td style="text-align: right">2</td><td>landen</td></tr> <tr><td style="text-align: right">2</td><td>lance</td></tr> <tr><td style="text-align: right">2</td><td>lamont</td></tr> <tr><td style="text-align: right">2</td><td>lajo</td></tr> <tr><td style="text-align: right">2</td><td>laboratorio</td></tr> <tr><td style="text-align: right">2</td><td>kyler</td></tr> <tr><td style="text-align: right">2</td><td>kyle</td></tr> <tr><td style="text-align: right">2</td><td>kyan</td></tr> <tr><td style="text-align: right">2</td><td>kuzmin</td></tr> <tr><td style="text-align: right">2</td><td>kuroda</td></tr> <tr><td style="text-align: right">2</td><td>korbin</td></tr> <tr><td style="text-align: right">2</td><td>kolton</td></tr> <tr><td style="text-align: right">2</td><td>kole</td></tr> <tr><td style="text-align: right">2</td><td>koby</td></tr> <tr><td style="text-align: right">2</td><td>klog</td></tr> 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right">2</td><td>keagan</td></tr> <tr><td style="text-align: right">2</td><td>kason</td></tr> <tr><td style="text-align: right">2</td><td>kasey</td></tr> <tr><td style="text-align: right">2</td><td>kasa</td></tr> <tr><td style="text-align: right">2</td><td>karson</td></tr> <tr><td style="text-align: right">2</td><td>karol</td></tr> <tr><td style="text-align: right">2</td><td>karl</td></tr> <tr><td style="text-align: right">2</td><td>kareem</td></tr> <tr><td style="text-align: right">2</td><td>kara</td></tr> <tr><td style="text-align: right">2</td><td>kanegon</td></tr> <tr><td style="text-align: right">2</td><td>kane</td></tr> <tr><td style="text-align: right">2</td><td>kamron</td></tr> <tr><td style="text-align: right">2</td><td>kamari</td></tr> <tr><td style="text-align: right">2</td><td>kaleb</td></tr> <tr><td style="text-align: right">2</td><td>kale</td></tr> <tr><td style="text-align: right">2</td><td>kaden</td></tr> <tr><td style="text-align: right">2</td><td>justin</td></tr> 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right">2</td><td>jorden</td></tr> <tr><td style="text-align: right">2</td><td>jonnes</td></tr> <tr><td style="text-align: right">2</td><td>jonah</td></tr> <tr><td style="text-align: right">2</td><td>johsun</td></tr> <tr><td style="text-align: right">2</td><td>johnny</td></tr> <tr><td style="text-align: right">2</td><td>joe</td></tr> <tr><td style="text-align: right">2</td><td>jodies</td></tr> <tr><td style="text-align: right">2</td><td>jimmy</td></tr> <tr><td style="text-align: right">2</td><td>jesper</td></tr> <tr><td style="text-align: right">2</td><td>jerome</td></tr> <tr><td style="text-align: right">2</td><td>jeremy</td></tr> <tr><td style="text-align: right">2</td><td>jeramiah</td></tr> <tr><td style="text-align: right">2</td><td>jeffrey</td></tr> <tr><td style="text-align: right">2</td><td>jeffh</td></tr> <tr><td style="text-align: right">2</td><td>jefferson</td></tr> <tr><td style="text-align: right">2</td><td>jeanluc</td></tr> <tr><td style="text-align: right">2</td><td>jayvon</td></tr> <tr><td style="text-align: right">2</td><td>jaylen</td></tr> <tr><td style="text-align: right">2</td><td>jaylan</td></tr> <tr><td style="text-align: right">2</td><td>jaydin</td></tr> <tr><td style="text-align: right">2</td><td>jayce</td></tr> <tr><td style="text-align: right">2</td><td>jaxon</td></tr> <tr><td style="text-align: right">2</td><td>javion</td></tr> <tr><td style="text-align: right">2</td><td>javier</td></tr> <tr><td style="text-align: right">2</td><td>jasper</td></tr> <tr><td style="text-align: right">2</td><td>jase</td></tr> <tr><td style="text-align: right">2</td><td>jarvis</td></tr> <tr><td style="text-align: right">2</td><td>jarrett</td></tr> <tr><td style="text-align: right">2</td><td>jaron</td></tr> <tr><td style="text-align: right">2</td><td>jarod</td></tr> <tr><td style="text-align: right">2</td><td>jaranda</td></tr> <tr><td style="text-align: right">2</td><td>japonesa</td></tr> <tr><td style="text-align: right">2</td><td>janet</td></tr> <tr><td style="text-align: right">2</td><td>janca</td></tr> <tr><td style="text-align: right">2</td><td>jan</td></tr> <tr><td style="text-align: right">2</td><td>jamison</td></tr> <tr><td style="text-align: right">2</td><td>jamir</td></tr> <tr><td style="text-align: right">2</td><td>jamie</td></tr> <tr><td style="text-align: right">2</td><td>jamex</td></tr> <tr><td style="text-align: right">2</td><td>jameson</td></tr> <tr><td style="text-align: right">2</td><td>jamarcus</td></tr> <tr><td style="text-align: right">2</td><td>jamar</td></tr> <tr><td style="text-align: right">2</td><td>jalen</td></tr> <tr><td style="text-align: right">2</td><td>jake</td></tr> <tr><td style="text-align: right">2</td><td>jaiden</td></tr> <tr><td style="text-align: right">2</td><td>jaerd</td></tr> <tr><td style="text-align: right">2</td><td>jaeden</td></tr> <tr><td style="text-align: right">2</td><td>jaden</td></tr> <tr><td style="text-align: right">2</td><td>jacques</td></tr> 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right">2</td><td>irvin</td></tr> <tr><td style="text-align: right">2</td><td>irleu</td></tr> <tr><td style="text-align: right">2</td><td>invite</td></tr> <tr><td style="text-align: right">2</td><td>inventories</td></tr> <tr><td style="text-align: right">2</td><td>interpromo</td></tr> <tr><td style="text-align: right">2</td><td>inoterra</td></tr> <tr><td style="text-align: right">2</td><td>info02</td></tr> <tr><td style="text-align: right">2</td><td>info01</td></tr> <tr><td style="text-align: right">2</td><td>info001</td></tr> <tr><td style="text-align: right">2</td><td>indic</td></tr> <tr><td style="text-align: right">2</td><td>inanna</td></tr> <tr><td style="text-align: right">2</td><td>import</td></tr> <tr><td style="text-align: right">2</td><td>immanuel</td></tr> <tr><td style="text-align: right">2</td><td>ignacio</td></tr> <tr><td style="text-align: right">2</td><td>icbeu</td></tr> <tr><td style="text-align: right">2</td><td>ibrahim</td></tr> <tr><td style="text-align: right">2</td><td>iasi</td></tr> <tr><td style="text-align: right">2</td><td>hurnberto</td></tr> <tr><td style="text-align: right">2</td><td>hunter</td></tr> <tr><td style="text-align: right">2</td><td>hudix</td></tr> <tr><td style="text-align: right">2</td><td>http</td></tr> <tr><td style="text-align: right">2</td><td>houston</td></tr> <tr><td style="text-align: right">2</td><td>hostworks</td></tr> <tr><td style="text-align: right">2</td><td>hosting</td></tr> <tr><td style="text-align: right">2</td><td>hong</td></tr> <tr><td style="text-align: right">2</td><td>home</td></tr> <tr><td style="text-align: right">2</td><td>holly</td></tr> <tr><td style="text-align: right">2</td><td>hlds</td></tr> <tr><td style="text-align: right">2</td><td>hiro</td></tr> <tr><td style="text-align: right">2</td><td>hines</td></tr> <tr><td style="text-align: right">2</td><td>herrera</td></tr> <tr><td style="text-align: right">2</td><td>heriberto</td></tr> <tr><td style="text-align: right">2</td><td>henry</td></tr> <tr><td style="text-align: right">2</td><td>henrike</td></tr> <tr><td style="text-align: right">2</td><td>help</td></tr> <tr><td style="text-align: right">2</td><td>hector</td></tr> <tr><td style="text-align: right">2</td><td>heaven</td></tr> <tr><td style="text-align: right">2</td><td>heather</td></tr> <tr><td style="text-align: right">2</td><td>heath</td></tr> <tr><td style="text-align: right">2</td><td>hayley</td></tr> <tr><td style="text-align: right">2</td><td>hayden</td></tr> <tr><td style="text-align: right">2</td><td>hassan</td></tr> <tr><td style="text-align: right">2</td><td>harvey</td></tr> <tr><td style="text-align: right">2</td><td>harrypotter</td></tr> <tr><td style="text-align: right">2</td><td>harry</td></tr> <tr><td style="text-align: right">2</td><td>harrison</td></tr> <tr><td style="text-align: right">2</td><td>harold</td></tr> <tr><td style="text-align: right">2</td><td>handel</td></tr> <tr><td style="text-align: right">2</td><td>haldaemon</td></tr> <tr><td style="text-align: right">2</td><td>haiping</td></tr> <tr><td style="text-align: right">2</td><td>haden</td></tr> <tr><td style="text-align: right">2</td><td>hachamo</td></tr> <tr><td style="text-align: right">2</td><td>guy</td></tr> <tr><td style="text-align: right">2</td><td>gunner</td></tr> <tr><td style="text-align: right">2</td><td>gunnar</td></tr> <tr><td style="text-align: right">2</td><td>gullen</td></tr> <tr><td style="text-align: right">2</td><td>guglielmo</td></tr> <tr><td style="text-align: right">2</td><td>guadalupe</td></tr> <tr><td style="text-align: right">2</td><td>greyson</td></tr> <tr><td style="text-align: right">2</td><td>gregory</td></tr> <tr><td style="text-align: right">2</td><td>grant</td></tr> <tr><td style="text-align: right">2</td><td>grady</td></tr> <tr><td style="text-align: right">2</td><td>gordon</td></tr> <tr><td style="text-align: right">2</td><td>gomi</td></tr> <tr><td style="text-align: right">2</td><td>glenn</td></tr> <tr><td style="text-align: right">2</td><td>gituser</td></tr> <tr><td style="text-align: right">2</td><td>gitosis</td></tr> <tr><td style="text-align: right">2</td><td>girl</td></tr> <tr><td style="text-align: right">2</td><td>giovanny</td></tr> <tr><td style="text-align: right">2</td><td>giovanni</td></tr> <tr><td style="text-align: right">2</td><td>gilbert</td></tr> <tr><td style="text-align: right">2</td><td>gighen</td></tr> <tr><td style="text-align: right">2</td><td>gideon</td></tr> <tr><td style="text-align: right">2</td><td>gianni</td></tr> <tr><td style="text-align: right">2</td><td>giancarlo</td></tr> <tr><td style="text-align: right">2</td><td>ghost</td></tr> <tr><td style="text-align: right">2</td><td>gestion</td></tr> <tr><td style="text-align: right">2</td><td>gesco</td></tr> <tr><td style="text-align: right">2</td><td>gervalle</td></tr> <tr><td style="text-align: right">2</td><td>gerrardo</td></tr> <tr><td style="text-align: right">2</td><td>german</td></tr> <tr><td style="text-align: right">2</td><td>geral</td></tr> <tr><td style="text-align: right">2</td><td>georgey</td></tr> <tr><td style="text-align: right">2</td><td>gdtest</td></tr> <tr><td style="text-align: right">2</td><td>gavyn</td></tr> <tr><td style="text-align: right">2</td><td>gavin</td></tr> <tr><td style="text-align: right">2</td><td>gaven</td></tr> <tr><td style="text-align: right">2</td><td>gatti</td></tr> <tr><td style="text-align: right">2</td><td>gastuser1</td></tr> <tr><td style="text-align: right">2</td><td>gastuser</td></tr> <tr><td style="text-align: right">2</td><td>garrett</td></tr> <tr><td style="text-align: right">2</td><td>garret</td></tr> <tr><td style="text-align: right">2</td><td>gapftp</td></tr> <tr><td style="text-align: right">2</td><td>gage</td></tr> <tr><td style="text-align: right">2</td><td>gaelle</td></tr> <tr><td style="text-align: right">2</td><td>ftpuser02</td></tr> <tr><td style="text-align: right">2</td><td>ftpuser01</td></tr> <tr><td style="text-align: right">2</td><td>ftpuser001</td></tr> <tr><td style="text-align: right">2</td><td>ftp-docs</td></tr> <tr><td style="text-align: right">2</td><td>ftparchive</td></tr> <tr><td style="text-align: right">2</td><td>friend</td></tr> <tr><td style="text-align: right">2</td><td>frieder</td></tr> <tr><td style="text-align: right">2</td><td>frequence</td></tr> <tr><td style="text-align: right">2</td><td>freddy</td></tr> <tr><td style="text-align: right">2</td><td>franz</td></tr> <tr><td style="text-align: right">2</td><td>frankie</td></tr> <tr><td style="text-align: right">2</td><td>franco</td></tr> <tr><td style="text-align: right">2</td><td>francisco</td></tr> <tr><td style="text-align: right">2</td><td>francis</td></tr> <tr><td style="text-align: right">2</td><td>fotos</td></tr> <tr><td style="text-align: right">2</td><td>foto</td></tr> <tr><td style="text-align: right">2</td><td>forevermd</td></tr> <tr><td style="text-align: right">2</td><td>forestal</td></tr> <tr><td style="text-align: right">2</td><td>ford</td></tr> <tr><td style="text-align: right">2</td><td>flor</td></tr> <tr><td style="text-align: right">2</td><td>fletcher</td></tr> <tr><td style="text-align: right">2</td><td>five</td></tr> <tr><td style="text-align: right">2</td><td>fisio</td></tr> <tr><td style="text-align: right">2</td><td>fisica</td></tr> <tr><td style="text-align: right">2</td><td>fisher</td></tr> <tr><td style="text-align: right">2</td><td>firefox</td></tr> <tr><td style="text-align: right">2</td><td>finn</td></tr> <tr><td style="text-align: right">2</td><td>fimat</td></tr> <tr><td style="text-align: right">2</td><td>filosofia</td></tr> <tr><td style="text-align: right">2</td><td>fidel</td></tr> <tr><td style="text-align: right">2</td><td>ferreg</td></tr> <tr><td style="text-align: right">2</td><td>fernando</td></tr> <tr><td style="text-align: right">2</td><td>faxserver</td></tr> <tr><td style="text-align: right">2</td><td>fatura</td></tr> <tr><td style="text-align: right">2</td><td>fariba</td></tr> <tr><td style="text-align: right">2</td><td>factusol</td></tr> <tr><td style="text-align: right">2</td><td>fabrizio</td></tr> <tr><td style="text-align: right">2</td><td>fabiof</td></tr> <tr><td style="text-align: right">2</td><td>fabian</td></tr> <tr><td style="text-align: right">2</td><td>ezequiel</td></tr> <tr><td style="text-align: right">2</td><td>evo</td></tr> <tr><td style="text-align: right">2</td><td>evan</td></tr> <tr><td style="text-align: right">2</td><td>euser</td></tr> <tr><td style="text-align: right">2</td><td>eugene</td></tr> <tr><td style="text-align: right">2</td><td>ethen</td></tr> <tr><td style="text-align: right">2</td><td>ethan</td></tr> <tr><td style="text-align: right">2</td><td>estrela</td></tr> <tr><td style="text-align: right">2</td><td>estoque</td></tr> <tr><td style="text-align: right">2</td><td>estevan</td></tr> <tr><td style="text-align: right">2</td><td>esterno</td></tr> <tr><td style="text-align: right">2</td><td>ertan</td></tr> <tr><td style="text-align: right">2</td><td>ernest</td></tr> <tr><td style="text-align: right">2</td><td>erik</td></tr> <tr><td style="text-align: right">2</td><td>erick</td></tr> <tr><td style="text-align: right">2</td><td>eppc</td></tr> <tr><td style="text-align: right">2</td><td>enzo</td></tr> <tr><td style="text-align: right">2</td><td>enrique</td></tr> <tr><td style="text-align: right">2</td><td>endless</td></tr> <tr><td style="text-align: right">2</td><td>emmett</td></tr> <tr><td style="text-align: right">2</td><td>emmanuel</td></tr> <tr><td style="text-align: right">2</td><td>emilio</td></tr> <tr><td style="text-align: right">2</td><td>emerson</td></tr> <tr><td style="text-align: right">2</td><td>emanuel</td></tr> <tr><td style="text-align: right">2</td><td>elizabeth</td></tr> <tr><td style="text-align: right">2</td><td>elisha</td></tr> <tr><td style="text-align: right">2</td><td>elias</td></tr> <tr><td style="text-align: right">2</td><td>elian</td></tr> <tr><td style="text-align: right">2</td><td>eli</td></tr> <tr><td style="text-align: right">2</td><td>eleve</td></tr> <tr><td style="text-align: right">2</td><td>efren</td></tr> <tr><td style="text-align: right">2</td><td>efrain</td></tr> <tr><td style="text-align: right">2</td><td>edwin</td></tr> <tr><td style="text-align: right">2</td><td>eduis</td></tr> <tr><td style="text-align: right">2</td><td>edgar</td></tr> <tr><td style="text-align: right">2</td><td>eddy</td></tr> <tr><td style="text-align: right">2</td><td>economia</td></tr> <tr><td style="text-align: right">2</td><td>ean</td></tr> <tr><td style="text-align: right">2</td><td>dylan</td></tr> <tr><td style="text-align: right">2</td><td>dwight</td></tr> <tr><td style="text-align: right">2</td><td>dwayne</td></tr> <tr><td style="text-align: right">2</td><td>dustin</td></tr> <tr><td style="text-align: right">2</td><td>duncan</td></tr> <tr><td style="text-align: right">2</td><td>dubikova</td></tr> <tr><td style="text-align: right">2</td><td>drew</td></tr> <tr><td style="text-align: right">2</td><td>draven</td></tr> <tr><td style="text-align: right">2</td><td>drake</td></tr> <tr><td style="text-align: right">2</td><td>doodz</td></tr> <tr><td style="text-align: right">2</td><td>donte</td></tr> <tr><td style="text-align: right">2</td><td>donovan</td></tr> <tr><td style="text-align: right">2</td><td>dominik</td></tr> <tr><td style="text-align: right">2</td><td>dole</td></tr> <tr><td style="text-align: right">2</td><td>doffen</td></tr> <tr><td style="text-align: right">2</td><td>divine</td></tr> <tr><td style="text-align: right">2</td><td>diskord</td></tr> <tr><td style="text-align: right">2</td><td>dimitri</td></tr> <tr><td style="text-align: right">2</td><td>dillan</td></tr> <tr><td style="text-align: right">2</td><td>dilion</td></tr> <tr><td style="text-align: right">2</td><td>diamond</td></tr> <tr><td style="text-align: right">2</td><td>dexter</td></tr> <tr><td style="text-align: right">2</td><td>devyn</td></tr> <tr><td style="text-align: right">2</td><td>devon</td></tr> <tr><td style="text-align: right">2</td><td>devin</td></tr> <tr><td style="text-align: right">2</td><td>deven</td></tr> <tr><td style="text-align: right">2</td><td>dev</td></tr> <tr><td style="text-align: right">2</td><td>destin</td></tr> <tr><td style="text-align: right">2</td><td>despacho</td></tr> <tr><td style="text-align: right">2</td><td>desktop</td></tr> <tr><td style="text-align: right">2</td><td>deshawn</td></tr> <tr><td style="text-align: right">2</td><td>deshaun</td></tr> <tr><td style="text-align: right">2</td><td>desarrollo</td></tr> <tr><td style="text-align: right">2</td><td>derick</td></tr> <tr><td style="text-align: right">2</td><td>derek</td></tr> <tr><td style="text-align: right">2</td><td>derecho</td></tr> <tr><td style="text-align: right">2</td><td>der</td></tr> <tr><td style="text-align: right">2</td><td>denzel</td></tr> <tr><td style="text-align: right">2</td><td>demarion</td></tr> <tr><td style="text-align: right">2</td><td>dell</td></tr> <tr><td style="text-align: right">2</td><td>dede</td></tr> <tr><td style="text-align: right">2</td><td>dean</td></tr> <tr><td style="text-align: right">2</td><td>deacon</td></tr> <tr><td style="text-align: right">2</td><td>db2</td></tr> <tr><td style="text-align: right">2</td><td>dayton</td></tr> <tr><td style="text-align: right">2</td><td>dawson</td></tr> <tr><td style="text-align: right">2</td><td>davon</td></tr> <tr><td style="text-align: right">2</td><td>davin</td></tr> <tr><td style="text-align: right">2</td><td>davide</td></tr> <tr><td style="text-align: right">2</td><td>davian</td></tr> <tr><td style="text-align: right">2</td><td>davea</td></tr> <tr><td style="text-align: right">2</td><td>dave</td></tr> <tr><td style="text-align: right">2</td><td>davaa</td></tr> <tr><td style="text-align: right">2</td><td>data</td></tr> <tr><td style="text-align: right">2</td><td>dasusr</td></tr> <tr><td style="text-align: right">2</td><td>darryl</td></tr> <tr><td style="text-align: right">2</td><td>darrius</td></tr> <tr><td style="text-align: right">2</td><td>darrin</td></tr> <tr><td style="text-align: right">2</td><td>darrell</td></tr> <tr><td style="text-align: right">2</td><td>darnell</td></tr> <tr><td style="text-align: right">2</td><td>darin</td></tr> <tr><td style="text-align: right">2</td><td>darien</td></tr> <tr><td style="text-align: right">2</td><td>darian</td></tr> <tr><td style="text-align: right">2</td><td>daquan</td></tr> <tr><td style="text-align: right">2</td><td>daniela</td></tr> <tr><td style="text-align: right">2</td><td>daniel</td></tr> <tr><td style="text-align: right">2</td><td>damien</td></tr> <tr><td style="text-align: right">2</td><td>damian</td></tr> <tr><td style="text-align: right">2</td><td>damata</td></tr> <tr><td style="text-align: right">2</td><td>damarion</td></tr> <tr><td style="text-align: right">2</td><td>dallin</td></tr> <tr><td style="text-align: right">2</td><td>dalibor</td></tr> <tr><td style="text-align: right">2</td><td>dale</td></tr> <tr><td style="text-align: right">2</td><td>dakota</td></tr> <tr><td style="text-align: right">2</td><td>daiana</td></tr> <tr><td style="text-align: right">2</td><td>dacia</td></tr> <tr><td style="text-align: right">2</td><td>cyrusimap</td></tr> <tr><td style="text-align: right">2</td><td>cvweb</td></tr> <tr><td style="text-align: right">2</td><td>curitel</td></tr> <tr><td style="text-align: right">2</td><td>cruz</td></tr> <tr><td style="text-align: right">2</td><td>cristopher</td></tr> <tr><td style="text-align: right">2</td><td>cristofer</td></tr> <tr><td style="text-align: right">2</td><td>cristian</td></tr> <tr><td style="text-align: right">2</td><td>credito</td></tr> <tr><td style="text-align: right">2</td><td>creative</td></tr> <tr><td style="text-align: right">2</td><td>cpd</td></tr> <tr><td style="text-align: right">2</td><td>couchdb</td></tr> <tr><td style="text-align: right">2</td><td>cornelius</td></tr> <tr><td style="text-align: right">2</td><td>corey</td></tr> <tr><td style="text-align: right">2</td><td>coremail</td></tr> <tr><td style="text-align: right">2</td><td>cordell</td></tr> <tr><td style="text-align: right">2</td><td>corbin</td></tr> <tr><td style="text-align: right">2</td><td>cooper</td></tr> <tr><td style="text-align: right">2</td><td>controle</td></tr> <tr><td style="text-align: right">2</td><td>contact</td></tr> <tr><td style="text-align: right">2</td><td>contab</td></tr> <tr><td style="text-align: right">2</td><td>consulta</td></tr> <tr><td style="text-align: right">2</td><td>connor</td></tr> <tr><td style="text-align: right">2</td><td>conner</td></tr> <tr><td style="text-align: right">2</td><td>confluence3</td></tr> <tr><td style="text-align: right">2</td><td>confluence2</td></tr> <tr><td style="text-align: right">2</td><td>comunica</td></tr> <tr><td style="text-align: right">2</td><td>compushop</td></tr> <tr><td style="text-align: right">2</td><td>compras</td></tr> <tr><td style="text-align: right">2</td><td>comnet</td></tr> <tr><td style="text-align: right">2</td><td>commun</td></tr> <tr><td style="text-align: right">2</td><td>commercial</td></tr> <tr><td style="text-align: right">2</td><td>comexi</td></tr> <tr><td style="text-align: right">2</td><td>colton</td></tr> <tr><td style="text-align: right">2</td><td>collin</td></tr> <tr><td style="text-align: right">2</td><td>colin</td></tr> <tr><td style="text-align: right">2</td><td>coleman</td></tr> <tr><td style="text-align: right">2</td><td>colby</td></tr> <tr><td style="text-align: right">2</td><td>cohen</td></tr> <tr><td style="text-align: right">2</td><td>cody</td></tr> <tr><td style="text-align: right">2</td><td>coco</td></tr> <tr><td style="text-align: right">2</td><td>coca</td></tr> <tr><td style="text-align: right">2</td><td>coby</td></tr> <tr><td style="text-align: right">2</td><td>cobranza</td></tr> <tr><td style="text-align: right">2</td><td>clyde</td></tr> <tr><td style="text-align: right">2</td><td>clifford</td></tr> <tr><td style="text-align: right">2</td><td>client</td></tr> <tr><td style="text-align: right">2</td><td>clever</td></tr> <tr><td style="text-align: right">2</td><td>clayton</td></tr> <tr><td style="text-align: right">2</td><td>clay</td></tr> <tr><td style="text-align: right">2</td><td>clarissa</td></tr> <tr><td style="text-align: right">2</td><td>clarisa</td></tr> <tr><td style="text-align: right">2</td><td>clarence</td></tr> <tr><td style="text-align: right">2</td><td>cisco</td></tr> <tr><td style="text-align: right">2</td><td>ciprian</td></tr> <tr><td style="text-align: right">2</td><td>ciencias</td></tr> <tr><td style="text-align: right">2</td><td>christian</td></tr> <tr><td style="text-align: right">2</td><td>chris</td></tr> <tr><td style="text-align: right">2</td><td>chorist</td></tr> <tr><td style="text-align: right">2</td><td>chishin</td></tr> <tr><td style="text-align: right">2</td><td>chidalgo</td></tr> <tr><td style="text-align: right">2</td><td>chaz</td></tr> <tr><td style="text-align: right">2</td><td>chase</td></tr> <tr><td style="text-align: right">2</td><td>charlie</td></tr> <tr><td style="text-align: right">2</td><td>chance</td></tr> <tr><td style="text-align: right">2</td><td>cgi</td></tr> <tr><td style="text-align: right">2</td><td>cesar</td></tr> <tr><td style="text-align: right">2</td><td>cedric</td></tr> <tr><td style="text-align: right">2</td><td>cecilia</td></tr> <tr><td style="text-align: right">2</td><td>cayden</td></tr> <tr><td style="text-align: right">2</td><td>catchall</td></tr> <tr><td style="text-align: right">2</td><td>castrain</td></tr> <tr><td style="text-align: right">2</td><td>cason</td></tr> <tr><td style="text-align: right">2</td><td>cash</td></tr> <tr><td style="text-align: right">2</td><td>casey</td></tr> <tr><td style="text-align: right">2</td><td>carson</td></tr> <tr><td style="text-align: right">2</td><td>carmelo</td></tr> <tr><td style="text-align: right">2</td><td>carlos</td></tr> <tr><td style="text-align: right">2</td><td>capp</td></tr> <tr><td style="text-align: right">2</td><td>cap</td></tr> <tr><td style="text-align: right">2</td><td>candie</td></tr> <tr><td style="text-align: right">2</td><td>campbell</td></tr> <tr><td style="text-align: right">2</td><td>camila</td></tr> <tr><td style="text-align: right">2</td><td>cameron</td></tr> <tr><td style="text-align: right">2</td><td>camden</td></tr> <tr><td style="text-align: right">2</td><td>calvin</td></tr> <tr><td style="text-align: right">2</td><td>calle</td></tr> <tr><td style="text-align: right">2</td><td>cale</td></tr> <tr><td style="text-align: right">2</td><td>caixa</td></tr> <tr><td style="text-align: right">2</td><td>caden</td></tr> <tr><td style="text-align: right">2</td><td>cade</td></tr> <tr><td style="text-align: right">2</td><td>byrun</td></tr> 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right">1</td><td>ssjangter</td></tr> <tr><td style="text-align: right">1</td><td>sshserver</td></tr> <tr><td style="text-align: right">1</td><td>sshdu</td></tr> <tr><td style="text-align: right">1</td><td>sr.juttamaria</td></tr> <tr><td style="text-align: right">1</td><td>sr.immelda</td></tr> <tr><td style="text-align: right">1</td><td>squirreluser</td></tr> <tr><td style="text-align: right">1</td><td>squid</td></tr> <tr><td style="text-align: right">1</td><td>sponsor</td></tr> <tr><td style="text-align: right">1</td><td>s.ortner</td></tr> <tr><td style="text-align: right">1</td><td>soporte</td></tr> <tr><td style="text-align: right">1</td><td>sniff</td></tr> <tr><td style="text-align: right">1</td><td>snccsite</td></tr> <tr><td style="text-align: right">1</td><td>smmta</td></tr> <tr><td style="text-align: right">1</td><td>smcgrath</td></tr> <tr><td style="text-align: right">1</td><td>skaley</td></tr> <tr><td style="text-align: right">1</td><td>sirsi</td></tr> <tr><td 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right">1</td><td>gregor</td></tr> <tr><td style="text-align: right">1</td><td>gracie</td></tr> <tr><td style="text-align: right">1</td><td>global</td></tr> <tr><td style="text-align: right">1</td><td>Giani</td></tr> <tr><td style="text-align: right">1</td><td>ghaith</td></tr> <tr><td style="text-align: right">1</td><td>gerry</td></tr> <tr><td style="text-align: right">1</td><td>gerald</td></tr> <tr><td style="text-align: right">1</td><td>genoveva</td></tr> <tr><td style="text-align: right">1</td><td>generalmanager</td></tr> <tr><td style="text-align: right">1</td><td>geburtshilfe</td></tr> <tr><td style="text-align: right">1</td><td>gdm</td></tr> <tr><td style="text-align: right">1</td><td>gavrilov</td></tr> <tr><td style="text-align: right">1</td><td>gasse</td></tr> <tr><td style="text-align: right">1</td><td>gary</td></tr> <tr><td style="text-align: right">1</td><td>gameserver</td></tr> <tr><td style="text-align: right">1</td><td>fu</td></tr> <tr><td style="text-align: right">1</td><td>ftp_wooripa</td></tr> <tr><td style="text-align: right">1</td><td>ftpuser2</td></tr> <tr><td style="text-align: right">1</td><td>ftpuser1</td></tr> <tr><td style="text-align: right">1</td><td>ftptest2</td></tr> <tr><td style="text-align: right">1</td><td>ftptest1</td></tr> <tr><td style="text-align: right">1</td><td>ftptemp</td></tr> <tr><td style="text-align: right">1</td><td>ftpsprings</td></tr> <tr><td style="text-align: right">1</td><td>ftpsoftware</td></tr> <tr><td style="text-align: right">1</td><td>ftpserver</td></tr> <tr><td style="text-align: right">1</td><td>ftpsecure</td></tr> <tr><td style="text-align: right">1</td><td>ftps</td></tr> <tr><td style="text-align: right">1</td><td>ftpd</td></tr> <tr><td style="text-align: right">1</td><td>ftpc</td></tr> <tr><td style="text-align: right">1</td><td>ftpadmin</td></tr> <tr><td style="text-align: right">1</td><td>ftn</td></tr> <tr><td style="text-align: right">1</td><td>frei</td></tr> <tr><td style="text-align: right">1</td><td>freeze</td></tr> <tr><td style="text-align: right">1</td><td>freeman</td></tr> <tr><td style="text-align: right">1</td><td>frankej</td></tr> <tr><td style="text-align: right">1</td><td>foeger</td></tr> <tr><td style="text-align: right">1</td><td>fm</td></tr> <tr><td style="text-align: right">1</td><td>first</td></tr> <tr><td style="text-align: right">1</td><td>fink</td></tr> <tr><td style="text-align: right">1</td><td>finder</td></tr> <tr><td style="text-align: right">1</td><td>files</td></tr> <tr><td style="text-align: right">1</td><td>filecoupon</td></tr> <tr><td style="text-align: right">1</td><td>file</td></tr> <tr><td style="text-align: right">1</td><td>festival</td></tr> <tr><td style="text-align: right">1</td><td>fester</td></tr> <tr><td style="text-align: right">1</td><td>fernandez</td></tr> <tr><td style="text-align: right">1</td><td>felixl</td></tr> <tr><td style="text-align: right">1</td><td>faruque</td></tr> <tr><td style="text-align: right">1</td><td>farrell</td></tr> <tr><td style="text-align: right">1</td><td>fankhauser</td></tr> <tr><td style="text-align: right">1</td><td>factoria</td></tr> <tr><td style="text-align: right">1</td><td>fabrice</td></tr> <tr><td style="text-align: right">1</td><td>fabio</td></tr> <tr><td style="text-align: right">1</td><td>ewt</td></tr> <tr><td style="text-align: right">1</td><td>etc</td></tr> <tr><td style="text-align: right">1</td><td>estudiante</td></tr> <tr><td style="text-align: right">1</td><td>ernie</td></tr> <tr><td style="text-align: right">1</td><td>emde</td></tr> <tr><td style="text-align: right">1</td><td>elmar</td></tr> <tr><td style="text-align: right">1</td><td>elke</td></tr> <tr><td style="text-align: right">1</td><td>eliza</td></tr> <tr><td style="text-align: right">1</td><td>elisa</td></tr> <tr><td style="text-align: right">1</td><td>ehasco</td></tr> <tr><td style="text-align: right">1</td><td>eggdrop</td></tr> <tr><td style="text-align: right">1</td><td>eggbreaker2</td></tr> <tr><td style="text-align: right">1</td><td>economist</td></tr> <tr><td style="text-align: right">1</td><td>eclasi</td></tr> <tr><td style="text-align: right">1</td><td>ec2-user</td></tr> <tr><td style="text-align: right">1</td><td>eb</td></tr> <tr><td style="text-align: right">1</td><td>eaguilar</td></tr> <tr><td style="text-align: right">1</td><td>dyndns</td></tr> <tr><td style="text-align: right">1</td><td>dwsadm</td></tr> <tr><td style="text-align: right">1</td><td>dr.springer</td></tr> <tr><td style="text-align: right">1</td><td>droguri</td></tr> <tr><td style="text-align: right">1</td><td>dovecot</td></tr> <tr><td style="text-align: right">1</td><td>doris</td></tr> <tr><td style="text-align: right">1</td><td>done</td></tr> <tr><td style="text-align: right">1</td><td>distributions</td></tr> <tr><td style="text-align: right">1</td><td>distribution</td></tr> <tr><td style="text-align: right">1</td><td>distcache</td></tr> <tr><td style="text-align: right">1</td><td>displays</td></tr> <tr><td style="text-align: right">1</td><td>dispatcher</td></tr> <tr><td style="text-align: right">1</td><td>dir.reiter</td></tr> <tr><td style="text-align: right">1</td><td>dir.liener</td></tr> <tr><td style="text-align: right">1</td><td>dir.leja</td></tr> <tr><td style="text-align: right">1</td><td>direktor</td></tr> <tr><td style="text-align: right">1</td><td>director</td></tr> <tr><td style="text-align: right">1</td><td>dir</td></tr> <tr><td style="text-align: right">1</td><td>dinsdale</td></tr> <tr><td style="text-align: right">1</td><td>dima</td></tr> <tr><td style="text-align: right">1</td><td>dilli</td></tr> <tr><td style="text-align: right">1</td><td>diethelm</td></tr> <tr><td style="text-align: right">1</td><td>diane</td></tr> <tr><td style="text-align: right">1</td><td>dialnet</td></tr> <tr><td style="text-align: right">1</td><td>diablo</td></tr> <tr><td style="text-align: right">1</td><td>dhcp</td></tr> <tr><td style="text-align: right">1</td><td>dfreeman</td></tr> <tr><td style="text-align: right">1</td><td>devilsins</td></tr> <tr><td style="text-align: right">1</td><td>development</td></tr> <tr><td style="text-align: right">1</td><td>developmend</td></tr> <tr><td style="text-align: right">1</td><td>developing</td></tr> <tr><td style="text-align: right">1</td><td>developers</td></tr> <tr><td style="text-align: right">1</td><td>developed</td></tr> <tr><td style="text-align: right">1</td><td>develop</td></tr> <tr><td style="text-align: right">1</td><td>deploys</td></tr> <tr><td style="text-align: right">1</td><td>denis</td></tr> <tr><td style="text-align: right">1</td><td>deng</td></tr> <tr><td style="text-align: right">1</td><td>demuji</td></tr> <tr><td style="text-align: right">1</td><td>demos</td></tr> <tr><td style="text-align: right">1</td><td>delta</td></tr> <tr><td style="text-align: right">1</td><td>de</td></tr> <tr><td style="text-align: right">1</td><td>ddtddt</td></tr> <tr><td style="text-align: right">1</td><td>dbus</td></tr> <tr><td style="text-align: right">1</td><td>db2fenc1</td></tr> <tr><td style="text-align: right">1</td><td>dasusr1</td></tr> <tr><td style="text-align: right">1</td><td>darwin</td></tr> <tr><td style="text-align: right">1</td><td>dark</td></tr> <tr><td style="text-align: right">1</td><td>dank</td></tr> <tr><td style="text-align: right">1</td><td>cvv</td></tr> <tr><td style="text-align: right">1</td><td>cvs</td></tr> <tr><td style="text-align: right">1</td><td>css</td></tr> <tr><td style="text-align: right">1</td><td>crond</td></tr> <tr><td style="text-align: right">1</td><td>cron</td></tr> <tr><td style="text-align: right">1</td><td>crespo.wang</td></tr> <tr><td style="text-align: right">1</td><td>courier</td></tr> <tr><td style="text-align: right">1</td><td>copier</td></tr> <tr><td style="text-align: right">1</td><td>controlling</td></tr> <tr><td style="text-align: right">1</td><td>content</td></tr> <tr><td style="text-align: right">1</td><td>co</td></tr> <tr><td style="text-align: right">1</td><td>closas</td></tr> <tr><td style="text-align: right">1</td><td>clock</td></tr> <tr><td style="text-align: right">1</td><td>clinic</td></tr> <tr><td style="text-align: right">1</td><td>clientsk</td></tr> <tr><td style="text-align: right">1</td><td>cjh</td></tr> <tr><td style="text-align: right">1</td><td>china</td></tr> <tr><td style="text-align: right">1</td><td>chave</td></tr> <tr><td style="text-align: right">1</td><td>chandimal</td></tr> <tr><td style="text-align: right">1</td><td>ch</td></tr> <tr><td style="text-align: right">1</td><td>cgi-bin</td></tr> <tr><td style="text-align: right">1</td><td>carstent</td></tr> <tr><td style="text-align: right">1</td><td>caleb</td></tr> <tr><td style="text-align: right">1</td><td>build</td></tr> <tr><td style="text-align: right">1</td><td>bugzilla</td></tr> <tr><td style="text-align: right">1</td><td>bscw</td></tr> <tr><td style="text-align: right">1</td><td>brute</td></tr> <tr><td style="text-align: right">1</td><td>brightcorea</td></tr> <tr><td style="text-align: right">1</td><td>boynec</td></tr> <tr><td style="text-align: right">1</td><td>bnc</td></tr> <tr><td style="text-align: right">1</td><td>bluecore</td></tr> <tr><td style="text-align: right">1</td><td>blog</td></tr> <tr><td style="text-align: right">1</td><td>birmingham</td></tr> <tr><td style="text-align: right">1</td><td>bind</td></tr> <tr><td style="text-align: right">1</td><td>beta</td></tr> <tr><td style="text-align: right">1</td><td>berthold</td></tr> <tr><td style="text-align: right">1</td><td>bernhar</td></tr> <tr><td style="text-align: right">1</td><td>benesch</td></tr> <tr><td style="text-align: right">1</td><td>beckerj</td></tr> <tr><td style="text-align: right">1</td><td>becker</td></tr> <tr><td style="text-align: right">1</td><td>bbernhar</td></tr> <tr><td style="text-align: right">1</td><td>bauer</td></tr> <tr><td style="text-align: right">1</td><td>basic</td></tr> <tr><td style="text-align: right">1</td><td>bane</td></tr> <tr><td style="text-align: right">1</td><td>bandit</td></tr> <tr><td style="text-align: right">1</td><td>bad</td></tr> <tr><td style="text-align: right">1</td><td>backuppc</td></tr> <tr><td style="text-align: right">1</td><td>backup1</td></tr> <tr><td style="text-align: right">1</td><td>backup02</td></tr> <tr><td style="text-align: right">1</td><td>backup01</td></tr> <tr><td style="text-align: right">1</td><td>backup001</td></tr> <tr><td style="text-align: right">1</td><td>avouni</td></tr> <tr><td style="text-align: right">1</td><td>avahi</td></tr> <tr><td style="text-align: right">1</td><td>audio</td></tr> <tr><td style="text-align: right">1</td><td>atsuto</td></tr> <tr><td style="text-align: right">1</td><td>at</td></tr> <tr><td style="text-align: right">1</td><td>aster</td></tr> <tr><td style="text-align: right">1</td><td>armen</td></tr> <tr><td style="text-align: right">1</td><td>arieta</td></tr> <tr><td style="text-align: right">1</td><td>apple_search</td></tr> <tr><td style="text-align: right">1</td><td>apaches</td></tr> <tr><td style="text-align: right">1</td><td>apache2</td></tr> <tr><td style="text-align: right">1</td><td>apache1</td></tr> <tr><td style="text-align: right">1</td><td>apache02</td></tr> <tr><td style="text-align: right">1</td><td>apache01</td></tr> <tr><td style="text-align: right">1</td><td>apache001</td></tr> <tr><td style="text-align: right">1</td><td>anna</td></tr> <tr><td style="text-align: right">1</td><td>andrea</td></tr> <tr><td style="text-align: right">1</td><td>anaesthesie</td></tr> <tr><td style="text-align: right">1</td><td>amber</td></tr> <tr><td style="text-align: right">1</td><td>alyssa</td></tr> <tr><td style="text-align: right">1</td><td>alumno</td></tr> <tr><td style="text-align: right">1</td><td>alliance</td></tr> <tr><td style="text-align: right">1</td><td>alexl</td></tr> <tr><td style="text-align: right">1</td><td>ale</td></tr> <tr><td style="text-align: right">1</td><td>aion</td></tr> <tr><td style="text-align: right">1</td><td>adrian</td></tr> <tr><td style="text-align: right">1</td><td>admissions</td></tr> <tr><td style="text-align: right">1</td><td>a</td></tr> <tr><td style="text-align: right">1</td><td>1</td></tr> </tbody></table> Sun, 20 Jan 2013 00:00:00 +0000 https://cliffle.com/blog/ultimate-guide-to-3d-printing/ https://cliffle.com/blog/ultimate-guide-to-3d-printing/ <p>Back in the Fall, I was invited to contribute to <a href="http://blog.makezine.com/volume/make-ultimate-guide-to-3d-printing/">Make Magazine’s Ultimate Guide to 3D Printing</a>. (That’s me on the front page, squinting at the Ultimaker wiki.)</p> <p>If you’re in the market for a 3D printer, it’s a great place to start! We spent a weekend really putting these printers through their paces.</p> Fri, 23 Mar 2012 00:00:00 +0000 https://cliffle.com/blog/swddude/ https://cliffle.com/blog/swddude/ <p>I love the ARM Cortex-M series of microcontrollers. The sheer computational power they pack into a teensy, low-power package is almost embarrassing.</p> <p>But, many Cortex-M parts are small — 4x4 millimeters small — and don’t have the pins left over for JTAG. For these parts, ARM introduced a new debug interface, called SWD.</p> <p>Unfortunately, SWD isn’t well-supported by open-source tools. Support is in progress in most of them — including my personal favorite, OpenOCD — but I’ve had bad luck so far.</p> <p><a href="http://socialhacker.com/">Anton Staaf</a> was having the same issue, and decided to do something about it. He tricked the cheap, commonly-available FTDI FT232H chip into speaking the line-level SWD protocol. We’ve teamed up and, a week or so later, have something to show for it.</p> Wed, 14 Mar 2012 00:00:00 +0000 https://cliffle.com/pub/safe-self-modification/ https://cliffle.com/pub/safe-self-modification/ <p><a href="http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/en/us/pubs/archive/37204.pdf">This paper</a>, presented at PLDI ’11, describes a key innovation behind Native Client, which is (as far as I’m aware) an industry first: the ability to verify the safety of a code-generating program, like a JIT or language runtime, <em>and that of its output,</em> on the fly.</p> <p>We can even support self-modifying code, with very little runtime overhead for verification. I firmly believe that active runtimes involving some degree of JIT code generation are the future, and this paper shows that we don’t have to sacrifice security or reliability to support them.</p> <p>I designed the mechanisms behind this technology with Bennet Yee and David Sehr, for x86, x86-64, and ARM processors. The rest of the authors did the hard part: implementing it in a portable way and shipping it to the masses. If you’re using Chrome, you’re already using this technology.</p> <p>We received an internal Google award for this paper.</p> Sun, 13 Mar 2011 00:00:00 +0000 https://cliffle.com/blog/ace-monster-toys/ https://cliffle.com/blog/ace-monster-toys/ <p>I may spend a lot of my time working on robots, but I like people. I’ve noticed this in my professional life: I’m happier and more productive working on a small team, rather than solo.</p> <p>My day job has me working alone a lot of the time, so at the beginning of March, I decided to take matters into my own hands and “find the others.” I knew about <a href="http://noisebridge.net/">Noisebridge</a> in San Francisco, but they didn’t quite seem like my people — when I joined their IRC channel they suggested I jump in front of a train, in fact.</p> <p>So I was delighted to discover a hackerspace right down the street from me: <a href="http://acemonstertoys.org/">Ace Monster Toys</a> in Oakland.</p> Thu, 24 Feb 2011 00:00:00 +0000 https://cliffle.com/blog/making-thingiverse-faster/ https://cliffle.com/blog/making-thingiverse-faster/ <p><a href="http://thingiverse.com/">Thingiverse</a> has deployed <a href="https://github.com/cbiffle/thingiview.js">my modifications to Thingiviewer</a>, which were first seen on this very site powering the 3D Thing Previews. The internet is now just a little bit better. Woot!</p> Mon, 21 Feb 2011 00:00:00 +0000 https://cliffle.com/blog/fixing-cupcake-hbp-bolts/ https://cliffle.com/blog/fixing-cupcake-hbp-bolts/ <p>I love my <a href="http://wiki.makerbot.com/cchb1">heated build platform</a>. It’s the best upgrade my MakerBot has seen. No other change has improved my print quality and confidence to this degree.</p> <p>But if you look at the pictures on that page, you’ll notice my least favorite feature: the bolts, or as I call them, the MakerBot Industries Amazing Nozzle Destroyers. Fortunately, there’s an easy fix.</p> Thu, 17 Feb 2011 00:00:00 +0000 https://cliffle.com/blog/luhn/ https://cliffle.com/blog/luhn/ <p>In my previous professional life, I processed a lot of credit card numbers. When reading credit card numbers from an unknown source, it helps to have a fast way of checking basic validity — to filter out bogus input. Such a method exists: the <em>Luhn algorithm</em>. I developed a very fast implementation of the algorithm a few years ago, and I keep seeing it pop up other places.</p> Thu, 17 Feb 2011 00:00:00 +0000 https://cliffle.com/blog/using-pla/ https://cliffle.com/blog/using-pla/ <p><a href="http://en.wikipedia.org/wiki/Polylactic_acid">Polylactic Acid</a> is a compostable plastic that can be made from renewable resources — usually plants. Compared to ABS plastic, it’s much harder, warps much less, and can be crystal clear. When I first got my hands on some PLA filament in 2009, it had the potential to be my new favorite plastic…but getting it working took time.</p> Tue, 15 Feb 2011 00:00:00 +0000 https://cliffle.com/blog/hello-blag/ https://cliffle.com/blog/hello-blag/ <p>It’s been over two years since I last posted anything substantive on the net.</p> Wed, 11 Aug 2010 00:00:00 +0000 https://cliffle.com/pub/native-client-paper/ https://cliffle.com/pub/native-client-paper/ <blockquote> <p>Software Fault Isolation (SFI) is an effective approach to sandboxing binary code of questionable provenance, an interesting use case for native plugins in a Web browser. We present software fault isolation schemes for ARM and x86-64 that provide control-flow and memory integrity with average performance overhead of under 5% on ARM and 7% on x86-64. We believe these are the best known SFI implementations for these architectures, with significantly lower overhead than previous systems for similar architectures. Our experience suggests that these SFI implementations benefit from instruction-level parallelism, and have particularly small impact for workloads that are data memory-bound, both properties that tend to reduce the impact of our SFI systems for future CPU implementations.</p> </blockquote> <p>Presented at the 19th USENIX Security Symposium.</p> <ul> <li><a href="http://research.google.com/pubs/archive/35649.pdf">PDF</a></li> <li><a href="http://research.google.com/pubs/pub35649.html">More info at research.google.com</a></li> </ul> Sat, 19 May 2001 00:00:00 +0000 https://cliffle.com/esoterica/beatnik/ https://cliffle.com/esoterica/beatnik/ <h2 id="preface-from-the-future-2013">Preface FROM THE FUTURE! (2013)</h2> <p>Beatnik is a direct result of the flu-like symptoms and subsequent cognitive impairment that come with truly, deeply understanding Forth. Like Forth, it is a stack language that is syntax-free — or, thematically, “syntax is just, like, your <em>opinion</em>, man!”</p> <p>Like all of my esoteric languages written in the cold, dark winter of 2000, the Beatnik specification and example (posted verbatim below) contain an error to detect people trying to implement it. This is arguably rather rude. If you lost hours of your life frantically debugging your Beatnik implementation, trying to figure out why it doesn’t match the posted spec, then (1) I apologize and (2) I am impressed by your inexplicable dedication to absurdity.</p> <p>There is also a more subtle error: as a teenage American, I had only encountered a single set of Scrabble tiles with a single scoring system. Thus, Beatnik failed to even specify <em>which</em> Scrabble scoring system should be used. Many language libraries have locale-sensitivity issues; Beatnik may be one of the only languages whose <em>semantics</em> are locale-sensitive.</p> Wed, 16 May 2001 00:00:00 +0000 https://cliffle.com/esoterica/4dl/ https://cliffle.com/esoterica/4dl/ <h1 id="preface-from-the-future-2013">Preface FROM THE FUTURE! (2013)</h1> <p>Where <a href="https://cliffle.com/esoterica/hq9plus/">HQ9+</a> was a gag, 4DL began as a thought experiment. I was working at Charlie’s Espresso in Tempe at the time, and my shifts often had dead time that I used designing processor architectures and programming languages.</p> <p>I later learned, to my horror, that three- and four-dimensional instruction spaces are not actually uncommon (think: page-switching).</p> <p>I’ve preserved the 4DL definition below verbatim, in case people are curious. It contains an error, which I discovered early on but left in to see if anyone actually tried implementing the language. This became a habit.</p> Fri, 11 May 2001 00:00:00 +0000 https://cliffle.com/esoterica/hq9plus/ https://cliffle.com/esoterica/hq9plus/ <h2 id="preface-from-the-future-2013">Preface FROM THE FUTURE! (2013)</h2> <p>HQ9+ may wind up being my legacy. Created as an elaborate (and admittedly obscure) joke over 12 years ago, it’s somehow developed an enduring popularity that took me completely by surprise.</p>