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<title>Technical Foundations of Informatics</title>
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<li><a href="./">Technical Foundations of Informatics</a></li>
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<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>About the Book</a></li>
<li class="chapter" data-level="1" data-path="setup-machine.html"><a href="setup-machine.html"><i class="fa fa-check"></i><b>1</b> Setting up your Machine</a><ul>
<li class="chapter" data-level="1.1" data-path="setup-machine.html"><a href="setup-machine.html#git"><i class="fa fa-check"></i><b>1.1</b> Git</a><ul>
<li class="chapter" data-level="1.1.1" data-path="setup-machine.html"><a href="setup-machine.html#github"><i class="fa fa-check"></i><b>1.1.1</b> GitHub</a></li>
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<li class="chapter" data-level="1.2" data-path="setup-machine.html"><a href="setup-machine.html#command-line-tools-bash"><i class="fa fa-check"></i><b>1.2</b> Command-line Tools (Bash)</a><ul>
<li class="chapter" data-level="1.2.1" data-path="setup-machine.html"><a href="setup-machine.html#command-line-on-a-mac"><i class="fa fa-check"></i><b>1.2.1</b> Command-line on a Mac</a></li>
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<li class="chapter" data-level="1.3" data-path="setup-machine.html"><a href="setup-machine.html#text-editors"><i class="fa fa-check"></i><b>1.3</b> Text Editors</a><ul>
<li class="chapter" data-level="1.3.1" data-path="setup-machine.html"><a href="setup-machine.html#atom"><i class="fa fa-check"></i><b>1.3.1</b> Atom</a></li>
<li class="chapter" data-level="1.3.2" data-path="setup-machine.html"><a href="setup-machine.html#visual-studio-code"><i class="fa fa-check"></i><b>1.3.2</b> Visual Studio Code</a></li>
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<li class="chapter" data-level="1.4" data-path="setup-machine.html"><a href="setup-machine.html#r-language"><i class="fa fa-check"></i><b>1.4</b> R Language</a></li>
<li class="chapter" data-level="1.5" data-path="setup-machine.html"><a href="setup-machine.html#rstudio"><i class="fa fa-check"></i><b>1.5</b> RStudio</a></li>
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<li class="chapter" data-level="2" data-path="command-line.html"><a href="command-line.html"><i class="fa fa-check"></i><b>2</b> The Command Line</a><ul>
<li class="chapter" data-level="2.1" data-path="command-line.html"><a href="command-line.html#accessing-the-command-line"><i class="fa fa-check"></i><b>2.1</b> Accessing the Command-Line</a></li>
<li class="chapter" data-level="2.2" data-path="command-line.html"><a href="command-line.html#navigating-the-command-line"><i class="fa fa-check"></i><b>2.2</b> Navigating the Command Line</a><ul>
<li class="chapter" data-level="2.2.1" data-path="command-line.html"><a href="command-line.html#changing-directories"><i class="fa fa-check"></i><b>2.2.1</b> Changing Directories</a></li>
<li class="chapter" data-level="2.2.2" data-path="command-line.html"><a href="command-line.html#listing-files"><i class="fa fa-check"></i><b>2.2.2</b> Listing Files</a></li>
<li class="chapter" data-level="2.2.3" data-path="command-line.html"><a href="command-line.html#paths"><i class="fa fa-check"></i><b>2.2.3</b> Paths</a></li>
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<li class="chapter" data-level="2.3" data-path="command-line.html"><a href="command-line.html#file-commands"><i class="fa fa-check"></i><b>2.3</b> File Commands</a><ul>
<li class="chapter" data-level="2.3.1" data-path="command-line.html"><a href="command-line.html#learning-new-commands"><i class="fa fa-check"></i><b>2.3.1</b> Learning New Commands</a></li>
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<li class="chapter" data-level="2.4" data-path="command-line.html"><a href="command-line.html#dealing-with-errors"><i class="fa fa-check"></i><b>2.4</b> Dealing With Errors</a></li>
<li class="chapter" data-level="" data-path="command-line.html"><a href="command-line.html#resources-1"><i class="fa fa-check"></i>Resources</a></li>
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<li class="chapter" data-level="3" data-path="markdown.html"><a href="markdown.html"><i class="fa fa-check"></i><b>3</b> Markdown</a><ul>
<li class="chapter" data-level="3.1" data-path="markdown.html"><a href="markdown.html#writing-markdown"><i class="fa fa-check"></i><b>3.1</b> Writing Markdown</a><ul>
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<li class="chapter" data-level="3.1.2" data-path="markdown.html"><a href="markdown.html#text-blocks"><i class="fa fa-check"></i><b>3.1.2</b> Text Blocks</a></li>
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<li class="chapter" data-level="3.2" data-path="markdown.html"><a href="markdown.html#rendering-markdown"><i class="fa fa-check"></i><b>3.2</b> Rendering Markdown</a></li>
<li class="chapter" data-level="" data-path="markdown.html"><a href="markdown.html#resources-2"><i class="fa fa-check"></i>Resources</a></li>
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<li class="chapter" data-level="4" data-path="git-basics.html"><a href="git-basics.html"><i class="fa fa-check"></i><b>4</b> Git and GitHub</a><ul>
<li class="chapter" data-level="4.1" data-path="git-basics.html"><a href="git-basics.html#what-is-this-git-thing-anyway"><i class="fa fa-check"></i><b>4.1</b> What is this <em>git</em> thing anyway?</a><ul>
<li class="chapter" data-level="4.1.1" data-path="git-basics.html"><a href="git-basics.html#git-core-concepts"><i class="fa fa-check"></i><b>4.1.1</b> Git Core Concepts</a></li>
<li class="chapter" data-level="4.1.2" data-path="git-basics.html"><a href="git-basics.html#wait-but-what-is-github-then"><i class="fa fa-check"></i><b>4.1.2</b> Wait, but what is GitHub then?</a></li>
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<li class="chapter" data-level="4.2" data-path="git-basics.html"><a href="git-basics.html#installation-setup"><i class="fa fa-check"></i><b>4.2</b> Installation & Setup</a><ul>
<li class="chapter" data-level="4.2.1" data-path="git-basics.html"><a href="git-basics.html#creating-a-repo"><i class="fa fa-check"></i><b>4.2.1</b> Creating a Repo</a></li>
<li class="chapter" data-level="4.2.2" data-path="git-basics.html"><a href="git-basics.html#checking-status"><i class="fa fa-check"></i><b>4.2.2</b> Checking Status</a></li>
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<li class="chapter" data-level="4.3" data-path="git-basics.html"><a href="git-basics.html#making-changes"><i class="fa fa-check"></i><b>4.3</b> Making Changes</a><ul>
<li class="chapter" data-level="4.3.1" data-path="git-basics.html"><a href="git-basics.html#adding-files"><i class="fa fa-check"></i><b>4.3.1</b> Adding Files</a></li>
<li class="chapter" data-level="4.3.2" data-path="git-basics.html"><a href="git-basics.html#committing"><i class="fa fa-check"></i><b>4.3.2</b> Committing</a></li>
<li class="chapter" data-level="4.3.3" data-path="git-basics.html"><a href="git-basics.html#commit-history"><i class="fa fa-check"></i><b>4.3.3</b> Commit History</a></li>
<li class="chapter" data-level="4.3.4" data-path="git-basics.html"><a href="git-basics.html#reviewing-the-process"><i class="fa fa-check"></i><b>4.3.4</b> Reviewing the Process</a></li>
<li class="chapter" data-level="4.3.5" data-path="git-basics.html"><a href="git-basics.html#gitignore"><i class="fa fa-check"></i><b>4.3.5</b> The <code>.gitignore</code> File</a></li>
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<li class="chapter" data-level="4.4" data-path="git-basics.html"><a href="git-basics.html#github-and-remotes"><i class="fa fa-check"></i><b>4.4</b> GitHub and Remotes</a><ul>
<li class="chapter" data-level="4.4.1" data-path="git-basics.html"><a href="git-basics.html#forking-and-cloning"><i class="fa fa-check"></i><b>4.4.1</b> Forking and Cloning</a></li>
<li class="chapter" data-level="4.4.2" data-path="git-basics.html"><a href="git-basics.html#pushing-and-pulling"><i class="fa fa-check"></i><b>4.4.2</b> Pushing and Pulling</a></li>
<li class="chapter" data-level="4.4.3" data-path="git-basics.html"><a href="git-basics.html#reviewing-the-process-1"><i class="fa fa-check"></i><b>4.4.3</b> Reviewing The Process</a></li>
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<li class="chapter" data-level="4.5" data-path="git-basics.html"><a href="git-basics.html#course-assignments-on-github"><i class="fa fa-check"></i><b>4.5</b> Course Assignments on GitHub</a></li>
<li class="chapter" data-level="4.6" data-path="git-basics.html"><a href="git-basics.html#command-summary"><i class="fa fa-check"></i><b>4.6</b> Command Summary</a></li>
<li class="chapter" data-level="" data-path="git-basics.html"><a href="git-basics.html#resources-3"><i class="fa fa-check"></i>Resources</a></li>
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<li class="chapter" data-level="5" data-path="r-intro.html"><a href="r-intro.html"><i class="fa fa-check"></i><b>5</b> Introduction to R</a><ul>
<li class="chapter" data-level="5.1" data-path="r-intro.html"><a href="r-intro.html#programming-with-r"><i class="fa fa-check"></i><b>5.1</b> Programming with R</a></li>
<li class="chapter" data-level="5.2" data-path="r-intro.html"><a href="r-intro.html#running-r-scripts"><i class="fa fa-check"></i><b>5.2</b> Running R Scripts</a><ul>
<li class="chapter" data-level="5.2.1" data-path="r-intro.html"><a href="r-intro.html#running-r-cmd"><i class="fa fa-check"></i><b>5.2.1</b> Command-Line</a></li>
<li class="chapter" data-level="5.2.2" data-path="r-intro.html"><a href="r-intro.html#running-r-rstudio"><i class="fa fa-check"></i><b>5.2.2</b> RStudio</a></li>
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<li class="chapter" data-level="5.3" data-path="r-intro.html"><a href="r-intro.html#comments"><i class="fa fa-check"></i><b>5.3</b> Comments</a></li>
<li class="chapter" data-level="5.4" data-path="r-intro.html"><a href="r-intro.html#variables"><i class="fa fa-check"></i><b>5.4</b> Variables</a><ul>
<li class="chapter" data-level="5.4.1" data-path="r-intro.html"><a href="r-intro.html#basic-data-types"><i class="fa fa-check"></i><b>5.4.1</b> Basic Data Types</a></li>
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<li class="chapter" data-level="5.5" data-path="r-intro.html"><a href="r-intro.html#gettinghelp"><i class="fa fa-check"></i><b>5.5</b> Getting Help</a></li>
<li class="chapter" data-level="" data-path="r-intro.html"><a href="r-intro.html#resources-4"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="6" data-path="functions.html"><a href="functions.html"><i class="fa fa-check"></i><b>6</b> Functions</a><ul>
<li class="chapter" data-level="6.1" data-path="functions.html"><a href="functions.html#what-are-functions"><i class="fa fa-check"></i><b>6.1</b> What are Functions?</a></li>
<li class="chapter" data-level="6.2" data-path="functions.html"><a href="functions.html#how-to-use-functions"><i class="fa fa-check"></i><b>6.2</b> How to Use Functions</a></li>
<li class="chapter" data-level="6.3" data-path="functions.html"><a href="functions.html#built-in-r-functions"><i class="fa fa-check"></i><b>6.3</b> Built-in R Functions</a></li>
<li class="chapter" data-level="6.4" data-path="functions.html"><a href="functions.html#loading-functions"><i class="fa fa-check"></i><b>6.4</b> Loading Functions</a></li>
<li class="chapter" data-level="6.5" data-path="functions.html"><a href="functions.html#writing-functions"><i class="fa fa-check"></i><b>6.5</b> Writing Functions</a></li>
<li class="chapter" data-level="6.6" data-path="functions.html"><a href="functions.html#conditional-statements"><i class="fa fa-check"></i><b>6.6</b> Conditional Statements</a></li>
<li class="chapter" data-level="" data-path="functions.html"><a href="functions.html#resources-5"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="7" data-path="vectors.html"><a href="vectors.html"><i class="fa fa-check"></i><b>7</b> Vectors</a><ul>
<li class="chapter" data-level="7.1" data-path="vectors.html"><a href="vectors.html#what-is-a-vector"><i class="fa fa-check"></i><b>7.1</b> What is a Vector?</a></li>
<li class="chapter" data-level="7.2" data-path="vectors.html"><a href="vectors.html#creating-vectors"><i class="fa fa-check"></i><b>7.2</b> Creating Vectors</a></li>
<li class="chapter" data-level="7.3" data-path="vectors.html"><a href="vectors.html#vector-indices"><i class="fa fa-check"></i><b>7.3</b> Vector Indices</a><ul>
<li class="chapter" data-level="7.3.1" data-path="vectors.html"><a href="vectors.html#simple-numeric-indices"><i class="fa fa-check"></i><b>7.3.1</b> Simple Numeric Indices</a></li>
<li class="chapter" data-level="7.3.2" data-path="vectors.html"><a href="vectors.html#multiple-indices"><i class="fa fa-check"></i><b>7.3.2</b> Multiple Indices</a></li>
<li class="chapter" data-level="7.3.3" data-path="vectors.html"><a href="vectors.html#logical-indexing"><i class="fa fa-check"></i><b>7.3.3</b> Logical Indexing</a></li>
<li class="chapter" data-level="7.3.4" data-path="vectors.html"><a href="vectors.html#named-vectors-and-character-indexing"><i class="fa fa-check"></i><b>7.3.4</b> Named Vectors and Character Indexing</a></li>
</ul></li>
<li class="chapter" data-level="7.4" data-path="vectors.html"><a href="vectors.html#modifying-vectors"><i class="fa fa-check"></i><b>7.4</b> Modifying Vectors</a></li>
<li class="chapter" data-level="7.5" data-path="vectors.html"><a href="vectors.html#vectorized-operations"><i class="fa fa-check"></i><b>7.5</b> Vectorized Operations</a><ul>
<li class="chapter" data-level="7.5.1" data-path="vectors.html"><a href="vectors.html#vectorized-operators"><i class="fa fa-check"></i><b>7.5.1</b> Vectorized Operators</a></li>
<li class="chapter" data-level="7.5.2" data-path="vectors.html"><a href="vectors.html#vectorized-functions"><i class="fa fa-check"></i><b>7.5.2</b> Vectorized Functions</a></li>
<li class="chapter" data-level="7.5.3" data-path="vectors.html"><a href="vectors.html#recycling"><i class="fa fa-check"></i><b>7.5.3</b> Recycling</a></li>
<li class="chapter" data-level="7.5.4" data-path="vectors.html"><a href="vectors.html#r-is-a-vectorized-world"><i class="fa fa-check"></i><b>7.5.4</b> R Is a Vectorized World</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="vectors.html"><a href="vectors.html#resources-6"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="8" data-path="lists.html"><a href="lists.html"><i class="fa fa-check"></i><b>8</b> Lists</a><ul>
<li class="chapter" data-level="8.1" data-path="lists.html"><a href="lists.html#what-is-a-list"><i class="fa fa-check"></i><b>8.1</b> What is a List?</a></li>
<li class="chapter" data-level="8.2" data-path="lists.html"><a href="lists.html#creating-lists"><i class="fa fa-check"></i><b>8.2</b> Creating Lists</a></li>
<li class="chapter" data-level="8.3" data-path="lists.html"><a href="lists.html#accessing-list-elements"><i class="fa fa-check"></i><b>8.3</b> Accessing List Elements</a><ul>
<li class="chapter" data-level="8.3.1" data-path="lists.html"><a href="lists.html#lists-indexing-by-position"><i class="fa fa-check"></i><b>8.3.1</b> Indexing by position</a></li>
<li class="chapter" data-level="8.3.2" data-path="lists.html"><a href="lists.html#indexing-by-name"><i class="fa fa-check"></i><b>8.3.2</b> Indexing by Name</a></li>
<li class="chapter" data-level="8.3.3" data-path="lists.html"><a href="lists.html#indexing-by-logical-vector"><i class="fa fa-check"></i><b>8.3.3</b> Indexing by Logical Vector</a></li>
<li class="chapter" data-level="8.3.4" data-path="lists.html"><a href="lists.html#lists-dollar-shortcut"><i class="fa fa-check"></i><b>8.3.4</b> Extracting named elements with <code>$</code></a></li>
<li class="chapter" data-level="8.3.5" data-path="lists.html"><a href="lists.html#single-vs.double-brackets-vs.dollar"><i class="fa fa-check"></i><b>8.3.5</b> Single vs. Double Brackets vs. Dollar</a></li>
</ul></li>
<li class="chapter" data-level="8.4" data-path="lists.html"><a href="lists.html#modifying-lists"><i class="fa fa-check"></i><b>8.4</b> Modifying Lists</a></li>
<li class="chapter" data-level="8.5" data-path="lists.html"><a href="lists.html#the-lapply-function"><i class="fa fa-check"></i><b>8.5</b> The <code>lapply()</code> Function</a></li>
<li class="chapter" data-level="" data-path="lists.html"><a href="lists.html#resources-7"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="9" data-path="data-frames.html"><a href="data-frames.html"><i class="fa fa-check"></i><b>9</b> Data Frames</a><ul>
<li class="chapter" data-level="9.1" data-path="data-frames.html"><a href="data-frames.html#what-is-a-data-frame"><i class="fa fa-check"></i><b>9.1</b> What is a Data Frame?</a><ul>
<li class="chapter" data-level="9.1.1" data-path="data-frames.html"><a href="data-frames.html#creating-data-frames"><i class="fa fa-check"></i><b>9.1.1</b> Creating Data Frames</a></li>
<li class="chapter" data-level="9.1.2" data-path="data-frames.html"><a href="data-frames.html#describing-structure-of-data-frames"><i class="fa fa-check"></i><b>9.1.2</b> Describing Structure of Data Frames</a></li>
<li class="chapter" data-level="9.1.3" data-path="data-frames.html"><a href="data-frames.html#accessing-data-in-data-frames"><i class="fa fa-check"></i><b>9.1.3</b> Accessing Data in Data Frames</a></li>
</ul></li>
<li class="chapter" data-level="9.2" data-path="data-frames.html"><a href="data-frames.html#csv-files"><i class="fa fa-check"></i><b>9.2</b> Working with CSV Data</a><ul>
<li class="chapter" data-level="9.2.1" data-path="data-frames.html"><a href="data-frames.html#working-directory"><i class="fa fa-check"></i><b>9.2.1</b> Working Directory</a></li>
</ul></li>
<li class="chapter" data-level="9.3" data-path="data-frames.html"><a href="data-frames.html#factors"><i class="fa fa-check"></i><b>9.3</b> Factor Variables</a></li>
<li class="chapter" data-level="" data-path="data-frames.html"><a href="data-frames.html#resources-8"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="10" data-path="dplyr.html"><a href="dplyr.html"><i class="fa fa-check"></i><b>10</b> The <code>dplyr</code> Library</a><ul>
<li class="chapter" data-level="10.1" data-path="dplyr.html"><a href="dplyr.html#a-grammar-of-data-manipulation"><i class="fa fa-check"></i><b>10.1</b> A Grammar of Data Manipulation</a></li>
<li class="chapter" data-level="10.2" data-path="dplyr.html"><a href="dplyr.html#using-dplyr-functions"><i class="fa fa-check"></i><b>10.2</b> Using <code>dplyr</code> Functions</a><ul>
<li class="chapter" data-level="10.2.1" data-path="dplyr.html"><a href="dplyr.html#select"><i class="fa fa-check"></i><b>10.2.1</b> Select</a></li>
<li class="chapter" data-level="10.2.2" data-path="dplyr.html"><a href="dplyr.html#filter"><i class="fa fa-check"></i><b>10.2.2</b> Filter</a></li>
<li class="chapter" data-level="10.2.3" data-path="dplyr.html"><a href="dplyr.html#mutate"><i class="fa fa-check"></i><b>10.2.3</b> Mutate</a></li>
<li class="chapter" data-level="10.2.4" data-path="dplyr.html"><a href="dplyr.html#arrange"><i class="fa fa-check"></i><b>10.2.4</b> Arrange</a></li>
<li class="chapter" data-level="10.2.5" data-path="dplyr.html"><a href="dplyr.html#summarize"><i class="fa fa-check"></i><b>10.2.5</b> Summarize</a></li>
<li class="chapter" data-level="10.2.6" data-path="dplyr.html"><a href="dplyr.html#distinct"><i class="fa fa-check"></i><b>10.2.6</b> Distinct</a></li>
</ul></li>
<li class="chapter" data-level="10.3" data-path="dplyr.html"><a href="dplyr.html#multiple-operations"><i class="fa fa-check"></i><b>10.3</b> Multiple Operations</a><ul>
<li class="chapter" data-level="10.3.1" data-path="dplyr.html"><a href="dplyr.html#the-pipe-operator"><i class="fa fa-check"></i><b>10.3.1</b> The Pipe Operator</a></li>
</ul></li>
<li class="chapter" data-level="10.4" data-path="dplyr.html"><a href="dplyr.html#grouped-operations"><i class="fa fa-check"></i><b>10.4</b> Grouped Operations</a></li>
<li class="chapter" data-level="10.5" data-path="dplyr.html"><a href="dplyr.html#joins"><i class="fa fa-check"></i><b>10.5</b> Joins</a></li>
<li class="chapter" data-level="10.6" data-path="dplyr.html"><a href="dplyr.html#non-standard-evaluation-vs.standard-evaluation"><i class="fa fa-check"></i><b>10.6</b> Non-Standard Evaluation vs. Standard Evaluation</a><ul>
<li class="chapter" data-level="10.6.1" data-path="dplyr.html"><a href="dplyr.html#explicit-standard-evaluation"><i class="fa fa-check"></i><b>10.6.1</b> Explicit Standard Evaluation</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="dplyr.html"><a href="dplyr.html#resources-9"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="11" data-path="apis.html"><a href="apis.html"><i class="fa fa-check"></i><b>11</b> Accessing Web APIs</a><ul>
<li class="chapter" data-level="11.1" data-path="apis.html"><a href="apis.html#what-is-a-web-api"><i class="fa fa-check"></i><b>11.1</b> What is a Web API?</a></li>
<li class="chapter" data-level="11.2" data-path="apis.html"><a href="apis.html#restful-requests"><i class="fa fa-check"></i><b>11.2</b> RESTful Requests</a><ul>
<li class="chapter" data-level="11.2.1" data-path="apis.html"><a href="apis.html#uris"><i class="fa fa-check"></i><b>11.2.1</b> URIs</a></li>
<li class="chapter" data-level="11.2.2" data-path="apis.html"><a href="apis.html#http-verbs"><i class="fa fa-check"></i><b>11.2.2</b> HTTP Verbs</a></li>
</ul></li>
<li class="chapter" data-level="11.3" data-path="apis.html"><a href="apis.html#accessing-web-apis"><i class="fa fa-check"></i><b>11.3</b> Accessing Web APIs</a></li>
<li class="chapter" data-level="11.4" data-path="apis.html"><a href="apis.html#json"><i class="fa fa-check"></i><b>11.4</b> JSON Data</a><ul>
<li class="chapter" data-level="11.4.1" data-path="apis.html"><a href="apis.html#parsing-json"><i class="fa fa-check"></i><b>11.4.1</b> Parsing JSON</a></li>
<li class="chapter" data-level="11.4.2" data-path="apis.html"><a href="apis.html#flattening-data"><i class="fa fa-check"></i><b>11.4.2</b> Flattening Data</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="apis.html"><a href="apis.html#resources-10"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="12" data-path="r-markdown.html"><a href="r-markdown.html"><i class="fa fa-check"></i><b>12</b> R Markdown</a><ul>
<li class="chapter" data-level="12.1" data-path="r-markdown.html"><a href="r-markdown.html#r-markdown-and-rstudio"><i class="fa fa-check"></i><b>12.1</b> R Markdown and RStudio</a><ul>
<li class="chapter" data-level="12.1.1" data-path="r-markdown.html"><a href="r-markdown.html#creating-.rmd-files"><i class="fa fa-check"></i><b>12.1.1</b> Creating <code>.Rmd</code> Files</a></li>
<li class="chapter" data-level="12.1.2" data-path="r-markdown.html"><a href="r-markdown.html#rmd-content"><i class="fa fa-check"></i><b>12.1.2</b> <code>.Rmd</code> Content</a></li>
<li class="chapter" data-level="12.1.3" data-path="r-markdown.html"><a href="r-markdown.html#knitting-documents"><i class="fa fa-check"></i><b>12.1.3</b> Knitting Documents</a></li>
<li class="chapter" data-level="12.1.4" data-path="r-markdown.html"><a href="r-markdown.html#html"><i class="fa fa-check"></i><b>12.1.4</b> HTML</a></li>
</ul></li>
<li class="chapter" data-level="12.2" data-path="r-markdown.html"><a href="r-markdown.html#r-markdown-syntax"><i class="fa fa-check"></i><b>12.2</b> R Markdown Syntax</a><ul>
<li class="chapter" data-level="12.2.1" data-path="r-markdown.html"><a href="r-markdown.html#r-code-chunks"><i class="fa fa-check"></i><b>12.2.1</b> R Code Chunks</a></li>
<li class="chapter" data-level="12.2.2" data-path="r-markdown.html"><a href="r-markdown.html#inline-code"><i class="fa fa-check"></i><b>12.2.2</b> Inline Code</a></li>
</ul></li>
<li class="chapter" data-level="12.3" data-path="r-markdown.html"><a href="r-markdown.html#rendering-data"><i class="fa fa-check"></i><b>12.3</b> Rendering Data</a><ul>
<li class="chapter" data-level="12.3.1" data-path="r-markdown.html"><a href="r-markdown.html#rendering-strings"><i class="fa fa-check"></i><b>12.3.1</b> Rendering Strings</a></li>
<li class="chapter" data-level="12.3.2" data-path="r-markdown.html"><a href="r-markdown.html#rendering-lists"><i class="fa fa-check"></i><b>12.3.2</b> Rendering Lists</a></li>
<li class="chapter" data-level="12.3.3" data-path="r-markdown.html"><a href="r-markdown.html#rendering-tables"><i class="fa fa-check"></i><b>12.3.3</b> Rendering Tables</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="r-markdown.html"><a href="r-markdown.html#resources-11"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="13" data-path="ggplot2.html"><a href="ggplot2.html"><i class="fa fa-check"></i><b>13</b> The <code>gglot2</code> Library</a><ul>
<li class="chapter" data-level="13.1" data-path="ggplot2.html"><a href="ggplot2.html#a-grammar-of-graphics"><i class="fa fa-check"></i><b>13.1</b> A Grammar of Graphics</a></li>
<li class="chapter" data-level="13.2" data-path="ggplot2.html"><a href="ggplot2.html#basic-plotting-with-ggplot2"><i class="fa fa-check"></i><b>13.2</b> Basic Plotting with <code>ggplot2</code></a><ul>
<li class="chapter" data-level="13.2.1" data-path="ggplot2.html"><a href="ggplot2.html#ggplot2-library"><i class="fa fa-check"></i><b>13.2.1</b> <em>ggplot2</em> library</a></li>
<li class="chapter" data-level="13.2.2" data-path="ggplot2.html"><a href="ggplot2.html#mpg-data"><i class="fa fa-check"></i><b>13.2.2</b> <em>mpg</em> data</a></li>
<li class="chapter" data-level="13.2.3" data-path="ggplot2.html"><a href="ggplot2.html#our-first-ggplot"><i class="fa fa-check"></i><b>13.2.3</b> Our first ggplot</a></li>
<li class="chapter" data-level="13.2.4" data-path="ggplot2.html"><a href="ggplot2.html#aesthetic-mappings"><i class="fa fa-check"></i><b>13.2.4</b> Aesthetic Mappings</a></li>
</ul></li>
<li class="chapter" data-level="13.3" data-path="ggplot2.html"><a href="ggplot2.html#complex-plots"><i class="fa fa-check"></i><b>13.3</b> Complex Plots</a><ul>
<li class="chapter" data-level="13.3.1" data-path="ggplot2.html"><a href="ggplot2.html#specifying-geometry"><i class="fa fa-check"></i><b>13.3.1</b> Specifying Geometry</a></li>
<li class="chapter" data-level="13.3.2" data-path="ggplot2.html"><a href="ggplot2.html#styling-with-scales"><i class="fa fa-check"></i><b>13.3.2</b> Styling with Scales</a></li>
<li class="chapter" data-level="13.3.3" data-path="ggplot2.html"><a href="ggplot2.html#coordinate-systems"><i class="fa fa-check"></i><b>13.3.3</b> Coordinate Systems</a></li>
<li class="chapter" data-level="13.3.4" data-path="ggplot2.html"><a href="ggplot2.html#facets"><i class="fa fa-check"></i><b>13.3.4</b> Facets</a></li>
<li class="chapter" data-level="13.3.5" data-path="ggplot2.html"><a href="ggplot2.html#labels-annotations"><i class="fa fa-check"></i><b>13.3.5</b> Labels & Annotations</a></li>
</ul></li>
<li class="chapter" data-level="13.4" data-path="ggplot2.html"><a href="ggplot2.html#plotting-in-scripts"><i class="fa fa-check"></i><b>13.4</b> Plotting in Scripts</a></li>
<li class="chapter" data-level="13.5" data-path="ggplot2.html"><a href="ggplot2.html#other-visualization-libraries"><i class="fa fa-check"></i><b>13.5</b> Other Visualization Libraries</a></li>
<li class="chapter" data-level="" data-path="ggplot2.html"><a href="ggplot2.html#resources-12"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="14" data-path="git-branches.html"><a href="git-branches.html"><i class="fa fa-check"></i><b>14</b> Git Branches</a><ul>
<li class="chapter" data-level="14.1" data-path="git-branches.html"><a href="git-branches.html#git-branches-1"><i class="fa fa-check"></i><b>14.1</b> Git Branches</a></li>
<li class="chapter" data-level="14.2" data-path="git-branches.html"><a href="git-branches.html#merging"><i class="fa fa-check"></i><b>14.2</b> Merging</a><ul>
<li class="chapter" data-level="14.2.1" data-path="git-branches.html"><a href="git-branches.html#merge-conflicts"><i class="fa fa-check"></i><b>14.2.1</b> Merge Conflicts</a></li>
</ul></li>
<li class="chapter" data-level="14.3" data-path="git-branches.html"><a href="git-branches.html#undoing-changes"><i class="fa fa-check"></i><b>14.3</b> Undoing Changes</a></li>
<li class="chapter" data-level="14.4" data-path="git-branches.html"><a href="git-branches.html#github-and-branches"><i class="fa fa-check"></i><b>14.4</b> GitHub and Branches</a><ul>
<li class="chapter" data-level="14.4.1" data-path="git-branches.html"><a href="git-branches.html#github-pages"><i class="fa fa-check"></i><b>14.4.1</b> GitHub Pages</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="git-branches.html"><a href="git-branches.html#resources-13"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="15" data-path="git-collaboration.html"><a href="git-collaboration.html"><i class="fa fa-check"></i><b>15</b> Git Collaboration</a><ul>
<li class="chapter" data-level="15.1" data-path="git-collaboration.html"><a href="git-collaboration.html#centralized-workflow"><i class="fa fa-check"></i><b>15.1</b> Centralized Workflow</a></li>
<li class="chapter" data-level="15.2" data-path="git-collaboration.html"><a href="git-collaboration.html#feature-branch-workflow"><i class="fa fa-check"></i><b>15.2</b> Feature Branch Workflow</a></li>
<li class="chapter" data-level="15.3" data-path="git-collaboration.html"><a href="git-collaboration.html#forking-workflow"><i class="fa fa-check"></i><b>15.3</b> Forking Workflow</a><ul>
<li class="chapter" data-level="15.3.1" data-path="git-collaboration.html"><a href="git-collaboration.html#pull-requests"><i class="fa fa-check"></i><b>15.3.1</b> Pull Requests</a></li>
</ul></li>
<li class="chapter" data-level="" data-path="git-collaboration.html"><a href="git-collaboration.html#resources-14"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="16" data-path="shiny.html"><a href="shiny.html"><i class="fa fa-check"></i><b>16</b> The <code>shiny</code> Framework</a><ul>
<li class="chapter" data-level="16.1" data-path="shiny.html"><a href="shiny.html#creating-shiny-apps"><i class="fa fa-check"></i><b>16.1</b> Creating Shiny Apps</a><ul>
<li class="chapter" data-level="16.1.1" data-path="shiny.html"><a href="shiny.html#application-structure"><i class="fa fa-check"></i><b>16.1.1</b> Application Structure</a></li>
<li class="chapter" data-level="16.1.2" data-path="shiny.html"><a href="shiny.html#the-ui"><i class="fa fa-check"></i><b>16.1.2</b> The UI</a></li>
<li class="chapter" data-level="16.1.3" data-path="shiny.html"><a href="shiny.html#the-server"><i class="fa fa-check"></i><b>16.1.3</b> The Server</a></li>
</ul></li>
<li class="chapter" data-level="16.2" data-path="shiny.html"><a href="shiny.html#publishing-shiny-apps"><i class="fa fa-check"></i><b>16.2</b> Publishing Shiny Apps</a></li>
<li class="chapter" data-level="" data-path="shiny.html"><a href="shiny.html#resources-15"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="appendix"><span><b>Special Topics</b></span></li>
<li class="chapter" data-level="A" data-path="plotly.html"><a href="plotly.html"><i class="fa fa-check"></i><b>A</b> Plotly</a><ul>
<li class="chapter" data-level="A.1" data-path="plotly.html"><a href="plotly.html#getting-started"><i class="fa fa-check"></i><b>A.1</b> Getting Started</a></li>
<li class="chapter" data-level="A.2" data-path="plotly.html"><a href="plotly.html#basic-charts"><i class="fa fa-check"></i><b>A.2</b> Basic Charts</a></li>
<li class="chapter" data-level="A.3" data-path="plotly.html"><a href="plotly.html#layout"><i class="fa fa-check"></i><b>A.3</b> Layout</a></li>
<li class="chapter" data-level="A.4" data-path="plotly.html"><a href="plotly.html#hovers"><i class="fa fa-check"></i><b>A.4</b> Hovers</a></li>
<li class="chapter" data-level="" data-path="plotly.html"><a href="plotly.html#resources-16"><i class="fa fa-check"></i>Resources</a></li>
</ul></li>
<li class="chapter" data-level="B" data-path="control-structures.html"><a href="control-structures.html"><i class="fa fa-check"></i><b>B</b> R Language Control Structures</a><ul>
<li class="chapter" data-level="B.1" data-path="control-structures.html"><a href="control-structures.html#loops"><i class="fa fa-check"></i><b>B.1</b> Loops</a><ul>
<li class="chapter" data-level="B.1.1" data-path="control-structures.html"><a href="control-structures.html#for-loop"><i class="fa fa-check"></i><b>B.1.1</b> For Loop</a></li>
<li class="chapter" data-level="B.1.2" data-path="control-structures.html"><a href="control-structures.html#while-loop"><i class="fa fa-check"></i><b>B.1.2</b> While-loop</a></li>
<li class="chapter" data-level="B.1.3" data-path="control-structures.html"><a href="control-structures.html#repeat-loop"><i class="fa fa-check"></i><b>B.1.3</b> repeat-loop</a></li>
<li class="chapter" data-level="B.1.4" data-path="control-structures.html"><a href="control-structures.html#leaving-early-break-and-next"><i class="fa fa-check"></i><b>B.1.4</b> Leaving Early: <code>break</code> and <code>next</code></a></li>
<li class="chapter" data-level="B.1.5" data-path="control-structures.html"><a href="control-structures.html#when-not-to-use-loops-in-r"><i class="fa fa-check"></i><b>B.1.5</b> When (Not) To Use Loops In R?</a></li>
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<li class="chapter" data-level="B.2" data-path="control-structures.html"><a href="control-structures.html#more-about-if-and-else"><i class="fa fa-check"></i><b>B.2</b> More about <code>if</code> and <code>else</code></a><ul>
<li class="chapter" data-level="B.2.1" data-path="control-structures.html"><a href="control-structures.html#where-to-put-else"><i class="fa fa-check"></i><b>B.2.1</b> Where To Put Else</a></li>
<li class="chapter" data-level="B.2.2" data-path="control-structures.html"><a href="control-structures.html#return-value"><i class="fa fa-check"></i><b>B.2.2</b> Return Value</a></li>
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<li class="chapter" data-level="B.3" data-path="control-structures.html"><a href="control-structures.html#switch-choosing-between-multiple-conditions"><i class="fa fa-check"></i><b>B.3</b> <code>switch</code>: Choosing Between Multiple Conditions</a></li>
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<li class="chapter" data-level="C" data-path="data-tables.html"><a href="data-tables.html"><i class="fa fa-check"></i><b>C</b> Thinking Big: Data Tables</a><ul>
<li class="chapter" data-level="C.1" data-path="data-tables.html"><a href="data-tables.html#background-passing-by-value-and-passing-by-reference"><i class="fa fa-check"></i><b>C.1</b> Background: Passing By Value And Passing By Reference</a></li>
<li class="chapter" data-level="C.2" data-path="data-tables.html"><a href="data-tables.html#data-tables-introduction"><i class="fa fa-check"></i><b>C.2</b> Data Tables: Introduction</a><ul>
<li class="chapter" data-level="C.2.1" data-path="data-tables.html"><a href="data-tables.html#replacement-for-data-frames-sort-of"><i class="fa fa-check"></i><b>C.2.1</b> Replacement for Data Frames (Sort of)</a></li>
<li class="chapter" data-level="C.2.2" data-path="data-tables.html"><a href="data-tables.html#fast-reading-and-writing"><i class="fa fa-check"></i><b>C.2.2</b> Fast Reading and Writing</a></li>
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<li class="chapter" data-level="C.3" data-path="data-tables.html"><a href="data-tables.html#indexing-the-major-powerhorse-of-data-tables"><i class="fa fa-check"></i><b>C.3</b> Indexing: The Major Powerhorse of Data Tables</a><ul>
<li class="chapter" data-level="C.3.1" data-path="data-tables.html"><a href="data-tables.html#i-select-observations"><i class="fa fa-check"></i><b>C.3.1</b> i: Select Observations</a></li>
<li class="chapter" data-level="C.3.2" data-path="data-tables.html"><a href="data-tables.html#j-work-with-columns"><i class="fa fa-check"></i><b>C.3.2</b> j: Work with Columns</a></li>
<li class="chapter" data-level="C.3.3" data-path="data-tables.html"><a href="data-tables.html#group-in-by"><i class="fa fa-check"></i><b>C.3.3</b> Group in <code>by</code></a></li>
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<li class="chapter" data-level="C.4" data-path="data-tables.html"><a href="data-tables.html#create-variables-by-reference"><i class="fa fa-check"></i><b>C.4</b> <code>:=</code>–Create variables by reference</a></li>
<li class="chapter" data-level="C.5" data-path="data-tables.html"><a href="data-tables.html#keys"><i class="fa fa-check"></i><b>C.5</b> keys</a></li>
<li class="chapter" data-level="C.6" data-path="data-tables.html"><a href="data-tables.html#resources-17"><i class="fa fa-check"></i><b>C.6</b> Resources</a></li>
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<li class="chapter" data-level="D" data-path="remote-server.html"><a href="remote-server.html"><i class="fa fa-check"></i><b>D</b> Using Remote Server</a><ul>
<li class="chapter" data-level="D.1" data-path="remote-server.html"><a href="remote-server.html#server-setup"><i class="fa fa-check"></i><b>D.1</b> Server Setup</a></li>
<li class="chapter" data-level="D.2" data-path="remote-server.html"><a href="remote-server.html#connecting-to-the-remote-server"><i class="fa fa-check"></i><b>D.2</b> Connecting to the Remote Server</a></li>
<li class="chapter" data-level="D.3" data-path="remote-server.html"><a href="remote-server.html#copying-files"><i class="fa fa-check"></i><b>D.3</b> Copying Files</a><ul>
<li class="chapter" data-level="D.3.1" data-path="remote-server.html"><a href="remote-server.html#scp"><i class="fa fa-check"></i><b>D.3.1</b> scp</a></li>
<li class="chapter" data-level="D.3.2" data-path="remote-server.html"><a href="remote-server.html#rsync"><i class="fa fa-check"></i><b>D.3.2</b> rsync</a></li>
<li class="chapter" data-level="D.3.3" data-path="remote-server.html"><a href="remote-server.html#graphical-frontends"><i class="fa fa-check"></i><b>D.3.3</b> Graphical Frontends</a></li>
<li class="chapter" data-level="D.3.4" data-path="remote-server.html"><a href="remote-server.html#remote-editing"><i class="fa fa-check"></i><b>D.3.4</b> Remote Editing</a></li>
</ul></li>
<li class="chapter" data-level="D.4" data-path="remote-server.html"><a href="remote-server.html#r-and-rscript"><i class="fa fa-check"></i><b>D.4</b> R and Rscript</a><ul>
<li class="chapter" data-level="D.4.1" data-path="remote-server.html"><a href="remote-server.html#graphics-output-with-no-gui"><i class="fa fa-check"></i><b>D.4.1</b> Graphics Output with No GUI</a></li>
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<li class="chapter" data-level="D.5" data-path="remote-server.html"><a href="remote-server.html#life-on-server"><i class="fa fa-check"></i><b>D.5</b> Life on Server</a><ul>
<li class="chapter" data-level="D.5.1" data-path="remote-server.html"><a href="remote-server.html#be-social"><i class="fa fa-check"></i><b>D.5.1</b> Be Social!</a></li>
<li class="chapter" data-level="D.5.2" data-path="remote-server.html"><a href="remote-server.html#useful-things-to-do"><i class="fa fa-check"></i><b>D.5.2</b> Useful Things to Do</a></li>
<li class="chapter" data-level="D.5.3" data-path="remote-server.html"><a href="remote-server.html#permissions-and-ownership"><i class="fa fa-check"></i><b>D.5.3</b> Permissions and ownership</a></li>
<li class="chapter" data-level="D.5.4" data-path="remote-server.html"><a href="remote-server.html#more-than-one-connection"><i class="fa fa-check"></i><b>D.5.4</b> More than One Connection</a></li>
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<li class="chapter" data-level="D.6" data-path="remote-server.html"><a href="remote-server.html#advanced-usage"><i class="fa fa-check"></i><b>D.6</b> Advanced Usage</a><ul>
<li class="chapter" data-level="D.6.1" data-path="remote-server.html"><a href="remote-server.html#ssh-keys-.sshconfig"><i class="fa fa-check"></i><b>D.6.1</b> ssh keys, .ssh/config</a></li>
<li class="chapter" data-level="D.6.2" data-path="remote-server.html"><a href="remote-server.html#more-about-command-line-pipes-and-shell-patterns"><i class="fa fa-check"></i><b>D.6.2</b> More about command line: pipes and shell patterns</a></li>
<li class="chapter" data-level="D.6.3" data-path="remote-server.html"><a href="remote-server.html#running-rscript-in-ssh-session"><i class="fa fa-check"></i><b>D.6.3</b> Running RScript in ssh Session</a></li>
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<i class="fa fa-circle-o-notch fa-spin"></i><a href="./">Technical Foundations of Informatics</a>
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<h1 class="title">Technical Foundations of Informatics</h1>
<p class="author"><em><a href="http://mfviz.com/#/">Michael Freeman</a> and <a href="http://faculty.washington.edu/joelross/">Joel Ross</a></em></p>
<p class="date"><em>September 11, 2019</em></p>
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<div id="about-the-book" class="section level1 unnumbered">
<h1>About the Book</h1>
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<p><strong>Announcement</strong>: Starting in 2019, readings for the INFO 201 course will come from the textbook <em>Programming Skills for Data Science</em>, which is available to UW students for free via <a href="https://learning.oreilly.com/library/view/programming-skills-for/9780135159071/" target="_blank">SafariBooksOnline</a> or <a href="https://www.amazon.com/gp/product/0135133106" target="_blank">in print</a>. Unless specifically directed to a section of this online text, you should refer to the <em>Programming Skills for Data Science</em> textbook.</p>
This resource will remain online for free access into the future.
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<h2>
About the Book
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<p>This book covers the foundation skills necessary to start <strong><em>writing computer programs to work with data</em></strong> using modern and reproducible techniques. It requires no technical background. These materials were developed for the <strong>INFO 201: Technical Foundations of Informatics</strong> course taught at the <a href="https://ischool.uw.edu/">University of Washington Information School</a>; however they have been structured to be an online resource for anyone hoping to learn to work with information using programmatic approaches.</p>
<p><img src="img/index/by-nc-sa.png" alt="Creative Commons License" />
This book is licensed under a <a href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.</p>
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