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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E31">Th30</font></span>: <a NAME="T30"><span class="comment"><font color="firebrick">:: NUMBER13:30</font></span><br/></a><div class="add">3 <a href="number13.html#R1" title="NUMBER13:pred.1">satisfies_Sierpinski_problem_121_for</a> 7</div></div>
