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<li><a href="intro.html">Introduction</a></li>

<li class="dropdown-header"><a href="understand.html">Understand your data</a></li>
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<li><a href="import.html">Import</a></li>
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<li><a href="strings.html">Strings</a></li>
<li><a href="datetimes.html">Dates and times</a></li>

<li class="dropdown-header"><a href="program.html">Save time with programming</a></li>
<li><a href="functions.html">Express yourself with code</a></li>
<li><a href="data-structures.html">Data structures</a></li>
<li><a href="lists.html">Lists and functional programming</a></li>
<li><a href="robust-code.html">Robust code</a></li>

<li class="dropdown-header"><a href="science.html">Do science with data</a></li>
<li><a href="model-vis.html">Discover</a></li>
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<li>Test</li>

<li class="dropdown-header"><a href="communicate.html">Communicate your work</a></a></li>
<li><a href="rmarkdown.html">R Markdown</a></li>
<li><a href="shiny.html">Shiny</a></li>