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<a NAME="E1:45_1_1"/>
 <a href="topgen_1.html#K2" target="_self">Der</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#K4">Cl</a> <span class="p1">(<span class="default"><a href="topgen_1.html#K2" target="_self">Der</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
 
<b>by </b><i><a class="ref" href="topgen_1.html#T35" target="_self">Th35</a></i>;<br/>
<b>hence </b><a NAME="E2:45_1_1"/>
 <a href="topgen_1.html#K2" target="_self">Der</a> <font color="Maroon">c<sub>2</sub></font> is <a href="pre_topc.html#V4">closed</a>
 ;<br/>


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