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<li><a href="visualize.html">Visualize data</a></li>
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<li><a href="transform.html">Transform data</a></li>
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<li><a href="import.html">Import data</a></li>
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<li><a href="dates.html">Dates and times</a></li>
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<li><a href="strings.html">Regular expresssions</a></li>
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<li><a href="models.html">Model data</a></li>
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<li><a href="reports.html">Reporting and reproducible research</a></li>
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