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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">v</font> be   <a href="glib_000.html#NM10">Vertex</a> of <font color="Maroon">G</font>;<br/>



<b>thus </b><a NAME="E1:155"/><i><font color="Green">E39</font></i>: 
(  <a href="finseq_1.html#K3">len</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_001.html#K1" target="_self">.walkOf</a> <font color="Maroon">v</font></span>)</span> <a href="hidden.html#R1">=</a> 1 &amp; <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_001.html#K1" target="_self">.walkOf</a> <font color="Maroon">v</font></span>)</span> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> )
 <b>by </b><i><a class="ref" href="finseq_1.html#T57">FINSEQ_1:57</a></i>;<br/>

<b>hence </b><a NAME="E2:155"/><i><font color="Green">E40</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_001.html#K1" target="_self">.walkOf</a> <font color="Maroon">v</font></span>)</span> <a href="glib_001.html#K3" target="_self">.first()</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">v</font>
 ;<br/>

<b>thus </b><a NAME="E3:155"/>
<span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="glib_001.html#K1" target="_self">.walkOf</a> <font color="Maroon">v</font></span>)</span> <a href="glib_001.html#K4" target="_self">.last()</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">v</font>
 <b>by </b><i/>;<br/>

<b>hence </b><a NAME="E4:155"/>
<font color="Maroon">G</font> <a href="glib_001.html#K1" target="_self">.walkOf</a> <font color="Maroon">v</font> <a href="glib_001.html#R1" target="_self">is_Walk_from</a> <font color="Maroon">v</font>,<font color="Maroon">v</font>
 <b>by </b><i>, </i>;<br/>


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