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<b>let </b><font color="Maroon">c<sub>10</sub></font>, <font color="Maroon">c<sub>11</sub></font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>7</sub></font>;<br/>

<b>assume </b><a NAME="E1:84_1_2"/>
<font color="Maroon">c<sub>10</sub></font> <a href="analmetr.html#R7" target="_self">_|_</a> <font color="Maroon">c<sub>11</sub></font>
 ;<br/>

<b>then consider </b><font color="Maroon">c<sub>12</sub></font>, <font color="Maroon">c<sub>13</sub></font>, <font color="Maroon">c<sub>14</sub></font>, <font color="Maroon">c<sub>15</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>7</sub></font><b> such that </b><br/><a NAME="E3:84_1_2"/><i><font color="Green">E65</font></i>: 
( <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>13</sub></font> &amp; <font color="Maroon">c<sub>14</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>15</sub></font> &amp; <font color="Maroon">c<sub>10</sub></font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Maroon">c<sub>12</sub></font>,<font color="Maroon">c<sub>13</sub></font> &amp; <font color="Maroon">c<sub>11</sub></font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Maroon">c<sub>14</sub></font>,<font color="Maroon">c<sub>15</sub></font> )
 <b>and </b><br/><a NAME="E4:84_1_2"/><i><font color="Green">E66</font></i>: 
<font color="Maroon">c<sub>12</sub></font>,<font color="Maroon">c<sub>13</sub></font> <a href="analmetr.html#R4" target="_self">_|_</a> <font color="Maroon">c<sub>14</sub></font>,<font color="Maroon">c<sub>15</sub></font>
 <b>by </b><i><a class="ref" href="analmetr.html#T63" target="_self">Th63</a></i>;<br/>
<a NAME="E5:84_1_2"/>
<font color="Maroon">c<sub>14</sub></font>,<font color="Maroon">c<sub>15</sub></font> <a href="analmetr.html#R4" target="_self">_|_</a> <font color="Maroon">c<sub>12</sub></font>,<font color="Maroon">c<sub>13</sub></font>
 
<b>by </b><i><a class="txt" href="analmetr.html#E4:84_1_2"><i><font color="Green">E66</font></i></a>, <a class="ref" href="analmetr.html#D9" target="_self">Def9</a></i>;<br/>
<b>hence </b><a NAME="E6:84_1_2"/>
<font color="Maroon">c<sub>11</sub></font> <a href="analmetr.html#R7" target="_self">_|_</a> <font color="Maroon">c<sub>10</sub></font>
 <b>by </b><i><a class="txt" href="analmetr.html#E3:84_1_2"><i><font color="Green">E65</font></i></a>, <a class="ref" href="analmetr.html#T63" target="_self">Th63</a></i>;<br/>


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