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<b>reconsider </b><font color="Maroon">p</font> =  <a href="xboole_0.html#K1">{}</a>  as  <a href="graph_1.html#V8" target="_self">oriented</a>  <a href="graph_1.html#M2" target="_self">Chain</a> of <font color="Maroon">G</font> <b>by </b><i/>;<br/>
<b>take </b>
<font color="Maroon">p</font>
;<br/>

<b>thus </b><a NAME="E2:23_1_1"/>
( <font color="Maroon">p</font> is <a href="funct_1.html#V2">one-to-one</a> &amp; <font color="Maroon">p</font> is <a href="graph_1.html#V8" target="_self">oriented</a> )
 ;<br/>


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