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<b>let </b><font color="Maroon">G1</font> be   <a href="glib_000.html#NM2">_Graph</a>;<br/><b>let </b><font color="Maroon">G2</font> be  <a href="glib_000.html#V9" target="_self">spanning</a>  <a href="glib_000.html#M2" target="_self">Subgraph</a> of <font color="Maroon">G1</font>;<br/><b>let </b><font color="Maroon">G3</font> be  <a href="glib_000.html#V9" target="_self">spanning</a>  <a href="glib_000.html#M2" target="_self">Subgraph</a> of <font color="Maroon">G2</font>;<br/>





 <a href="glib_000.html#K25" target="_self">the_Vertices_of</a> <font color="Maroon">G3</font> = 
 <a href="glib_000.html#K25" target="_self">the_Vertices_of</a> <font color="Maroon">G2</font>
<b>by </b><i/>
<br/>.= 
 <a href="glib_000.html#K6" target="_self">the_Vertices_of</a> <font color="Maroon">G1</font>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E2:167"/>
<font color="Maroon">G3</font> is  <a href="glib_000.html#V9" target="_self">spanning</a>  <a href="glib_000.html#M2" target="_self">Subgraph</a> of <font color="Maroon">G1</font>
 <b>by </b><i>, </i>;<br/>


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