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<div><span class="kw">theorem </span><a NAME="T7"><span class="comment"><font color="firebrick">:: TAXONOM2:7</font></span><br/></a><div class="add"><span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a></span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> is  <a href="taxonom2.html#V3" title="TAXONOM2:attr.3">hierarchic</a> </div></div>
