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<b>let </b><font color="Maroon" title="c1">G</font> be   <a href="glib_000.html#NM2" title="GLIB_000:NM.2">_Graph</a>;<br/><b>let </b><font color="Maroon" title="c2">W</font> be    <a href="glib_001.html#M3" title="GLIB_001:mode.3">Walk</a> of <font color="Maroon" title="c1">G</font>;<br/>



<b>thus </b><a NAME="E1:108"/>
( <font color="Maroon" title="c2">W</font> is <a href="chord.html#V5" title="CHORD:attr.5">chordal</a> implies <font color="Maroon" title="c2">W</font> <a href="glib_001.html#K6" title="GLIB_001:func.6">.reverse()</a>  is <a href="chord.html#V5" title="CHORD:attr.5">chordal</a> )
 <b>by </b><i><a class="txt" href="chord.html#E103"><i><font color="Green" title="E85">Lm3</font></i></a></i>;<br/>

<b>assume </b><a NAME="E2:108"/>
<font color="Maroon" title="c2">W</font> <a href="glib_001.html#K6" title="GLIB_001:func.6">.reverse()</a>  is <a href="chord.html#V5" title="CHORD:attr.5">chordal</a>
 ;<br/>

<a NAME="E3:108"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon" title="c2">W</font> <a href="glib_001.html#K6" title="GLIB_001:func.6">.reverse()</a> </span>)</span> <a href="glib_001.html#K6" title="GLIB_001:func.6">.reverse()</a>  is <a href="chord.html#V5" title="CHORD:attr.5">chordal</a>
 
<b>by </b><i><a class="txt" href="chord.html#E103"><i><font color="Green" title="E85">Lm3</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:108"/>
<font color="Maroon" title="c2">W</font> is <a href="chord.html#V5" title="CHORD:attr.5">chordal</a>
 <b>by </b><i><a class="ref" href="glib_001.html#T27" title="GLIB_001:th.27">GLIB_001:27</a></i>;<br/>


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