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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Here, we define the base external force class. </p>
<p>The simple derived classes, such as gravity will be defined in applications. </p><dl class="section author"><dt>Author</dt><dd>Luhui Han, Chi ZHang and Xiangyu Hu </dd></dl>
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