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<b>let </b><font color="Maroon" title="c1">x</font>, <font color="Maroon" title="c2">b</font> be  non <a href="facirc_1.html#V1" title="FACIRC_1:attr.1">pair</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<a NAME="E1:40"/>
 <a href="msafree2.html#K2" title="MSAFREE2:func.2">InputVertices</a> <span class="p1">(<span class="default"><a href="twoscomp.html#K34" title="TWOSCOMP:func.34">CompStr</a> <font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">b</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="tarski.html#K2" title="TARSKI:func.2">{</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">b</font></span><a href="tarski.html#K2" title="TARSKI:func.2">}</a></span>
 
<b>by </b><i><a class="ref" href="facirc_1.html#T40" title="FACIRC_1:th.40">FACIRC_1:40</a></i>;<br/>
<b>hence </b><a NAME="E2:40"/>
not  <a href="msafree2.html#K2" title="MSAFREE2:func.2">InputVertices</a> <span class="p1">(<span class="default"><a href="twoscomp.html#K34" title="TWOSCOMP:func.34">CompStr</a> <font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c2">b</font></span>)</span> is <a href="facirc_1.html#V2" title="FACIRC_1:attr.2">with_pair</a>
 ;<br/>


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