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<b>let </b><font color="Maroon">G</font> be   <a href="lexbfs.html#NM2">V2Graph</a>;<br/>

<b>consider </b><font color="Maroon">f</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E2:36"/><i><font color="Green">E34</font></i>: 
( <font color="Maroon">G</font> <a href="funct_1.html#K1">.</a> <a href="lexbfs.html#K5" target="_self">V2LabelSelector</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> <a href="tarski.html#R1">c=</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font> )
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:36"/>
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><a href="lexbfs.html#K6" target="_self">the_V2Label_of</a> <font color="Maroon">G</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="glib_000.html#K6">the_Vertices_of</a> <font color="Maroon">G</font>
 <b>by </b><i/>;<br/>


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