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<b>let </b><font color="Maroon">G</font> be   <a href="group_1.html#NM1">Group</a>;<br/><b>let </b><font color="Maroon">N1</font> be  <a href="group_1.html#V1">strict</a> <a href="group_3.html#V1">normal</a>  <a href="group_2.html#M1">Subgroup</a> of <font color="Maroon">G</font>, <font color="Maroon">N2</font> be  <a href="group_1.html#V1">strict</a> <a href="group_3.html#V1">normal</a>  <a href="group_2.html#M1">Subgroup</a> of <font color="Maroon">G</font>, <font color="Maroon">N3</font> be  <a href="group_1.html#V1">strict</a> <a href="group_3.html#V1">normal</a>  <a href="group_2.html#M1">Subgroup</a> of <font color="Maroon">G</font>;<br/>



<a NAME="E1:77"/>
<font color="Maroon">N2</font> <a href="group_4.html#K8">"\/"</a> <font color="Maroon">N3</font> is  <a href="group_3.html#V1">normal</a>  <a href="group_2.html#M1">Subgroup</a> of <font color="Maroon">G</font>
 
<b>by </b><i><a class="ref" href="group_4.html#T72">GROUP_4:72</a></i>;<br/>
<b>hence </b><span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N1</font>,<span class="p2">(<span class="default"><font color="Maroon">N2</font> <a href="group_4.html#K8">"\/"</a> <font color="Maroon">N3</font></span>)</span></span><a href="group_5.html#K8" target="_self">.]</a></span> = 
<span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">N2</font> <a href="group_4.html#K8">"\/"</a> <font color="Maroon">N3</font></span>)</span>,<font color="Maroon">N1</font></span><a href="group_5.html#K8" target="_self">.]</a></span>
<b>by </b><i/>
<br/>.= 
<span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N2</font>,<font color="Maroon">N1</font></span><a href="group_5.html#K8" target="_self">.]</a></span> <a href="group_4.html#K8">"\/"</a> <span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N3</font>,<font color="Maroon">N1</font></span><a href="group_5.html#K8" target="_self">.]</a></span>
<b>by </b><i/>
<br/>.= 
<span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N1</font>,<font color="Maroon">N2</font></span><a href="group_5.html#K8" target="_self">.]</a></span> <a href="group_4.html#K8">"\/"</a> <span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N3</font>,<font color="Maroon">N1</font></span><a href="group_5.html#K8" target="_self">.]</a></span>
<b>by </b><i/>
<br/>.= 
<span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N1</font>,<font color="Maroon">N2</font></span><a href="group_5.html#K8" target="_self">.]</a></span> <a href="group_4.html#K8">"\/"</a> <span class="p1"><a href="group_5.html#K8" target="_self">[.</a><span class="default"><font color="Maroon">N1</font>,<font color="Maroon">N3</font></span><a href="group_5.html#K8" target="_self">.]</a></span>
<b>by </b><i/>
;<br/><br/>


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