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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be  non <a href="struct_0.html#V3">empty</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/>

<b>assume </b><a NAME="E1:20"/><i><font color="Green">E5</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="circcomb.html#R1">tolerates</a> <font color="Maroon">c<sub>2</sub></font>
 ;<br/>

<b>assume </b><a NAME="E2:20"/>
(  <a href="msafree2.html#K3">InnerVertices</a> <font color="Maroon">c<sub>1</sub></font> is   <a href="relat_1.html#NM1">Relation</a> &amp;  <a href="msafree2.html#K3">InnerVertices</a> <font color="Maroon">c<sub>2</sub></font> is   <a href="relat_1.html#NM1">Relation</a> )
 ;<br/>

<b>then reconsider </b><font color="Maroon">c<sub>3</sub></font> =  <a href="msafree2.html#K3">InnerVertices</a> <font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>4</sub></font> =  <a href="msafree2.html#K3">InnerVertices</a> <font color="Maroon">c<sub>2</sub></font> as   <a href="relat_1.html#NM1">Relation</a> ;<br/>
<a NAME="E4:20"/>
<font color="Maroon">c<sub>3</sub></font> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">c<sub>4</sub></font> is   <a href="relat_1.html#NM1">Relation</a>
 
;<br/>
<b>hence </b><a NAME="E5:20"/>
 <a href="msafree2.html#K3">InnerVertices</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="circcomb.html#K3">+*</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> is   <a href="relat_1.html#NM1">Relation</a>
 <b>by </b><i><a class="txt" href="facirc_1.html#E1:20"><i><font color="Green">E5</font></i></a>, <a class="ref" href="circcomb.html#T15">CIRCCOMB:15</a></i>;<br/>


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