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<b>let </b><font color="Maroon">G</font> be   <a href="glib_000.html#NM2">_Graph</a>;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/>



<b>set </b><font color="Maroon">GS</font> =  <a href="glib_000.html#K5">_GraphSelectors</a> ;<br/>
<b>set </b><font color="Maroon">G2</font> = <font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font>;<br/>
<a NAME="E1:38"/>
not  <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a>  <a href="hidden.html#R2">in</a>  <a href="glib_000.html#K5">_GraphSelectors</a> 
 
<b>by </b><i><a class="ref" href="glib_000.html#T2">GLIB_000:2</a></i>;<br/>
<a NAME="E2:38"/><b>then </b>
(  <a href="glib_000.html#K6">the_Vertices_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font> &amp;  <a href="glib_000.html#K7">the_Edges_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="glib_000.html#K7">the_Edges_of</a> <font color="Maroon">G</font> &amp;  <a href="glib_000.html#K10">the_Source_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font></span>)</span> <a href="funct_2.html#R1">=</a>  <a href="glib_000.html#K10">the_Source_of</a> <font color="Maroon">G</font> &amp;  <a href="glib_000.html#K11">the_Target_of</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font></span>)</span> <a href="funct_2.html#R1">=</a>  <a href="glib_000.html#K11">the_Target_of</a> <font color="Maroon">G</font> )
 
<b>by </b><i><a class="ref" href="glib_000.html#T13">GLIB_000:13</a></i>;<br/>
<b>hence </b><a NAME="E3:38"/>
<font color="Maroon">G</font> <a href="glib_000.html#K13">.set</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a> ,<font color="Maroon">X</font> <a href="glib_000.html#R5">==</a> <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="glib_000.html#D36">GLIB_000:def 36</a></i>;<br/>


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