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<a NAME="E1:45_1_1"/>
 <a href="xboole_0.html#K1">{}</a>  is    <a href="graph_1.html#M2">Chain</a> of <font color="Maroon">G</font>
 
<b>by </b><i><a class="ref" href="graph_1.html#T14">GRAPH_1:14</a></i>;<br/>
<b>hence </b><a NAME="E2:45_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being   <a href="graph_1.html#M2">Chain</a> of <font color="Maroon">G</font> st <font color="Olive">b<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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