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<a NAME="E1:5_1_1"/>
 <a href="xboole_0.html#K1">{}</a>  is  <a href="graph_1.html#V8">oriented</a>  <a href="graph_1.html#M2">Chain</a> of <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="graph_1.html#T14">GRAPH_1:14</a></i>;<br/>
<b>hence </b><a NAME="E2:5_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being   <a href="graph_1.html#M2">Chain</a> of <font color="Maroon">c<sub>1</sub></font> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="graph_1.html#V8">oriented</a> )
 ;<br/>


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