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<b>let </b><font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:84_1_1"/><i><font color="Green">E69</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> <a href="aff_4.html#R1" target="_self">'||'</a> <font color="Maroon">c<sub>4</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="aff_4.html#NR1" target="_self">is_plane</a>  )
 <b>and </b><br/><a NAME="E2:84_1_1"/><i><font color="Green">E70</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>5</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> <a href="aff_4.html#R1" target="_self">'||'</a> <font color="Maroon">c<sub>5</sub></font> &amp; <font color="Maroon">c<sub>5</sub></font> <a href="aff_4.html#NR1" target="_self">is_plane</a>  )
 ;<br/>

<a NAME="E3:84_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="aff_4.html#R1" target="_self">'||'</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="aff_4.html#E1:84"><i><font color="Green">E68</font></i></a>, <a class="txt" href="aff_4.html#E1:84_1_1"><i><font color="Green">E69</font></i></a>, <a class="txt" href="aff_4.html#E2:84_1_1"><i><font color="Green">E70</font></i></a>, <a class="ref" href="aff_4.html#T61" target="_self">Th61</a></i>;<br/>
<b>hence </b><a NAME="E4:84_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font>
 <b>by </b><i><a class="txt" href="aff_4.html#E1:84_1_1"><i><font color="Green">E69</font></i></a>, <a class="txt" href="aff_4.html#E2:84_1_1"><i><font color="Green">E70</font></i></a>, <a class="txt" href="aff_4.html#E80"><i><font color="Green">Lemma65</font></i></a></i>;<br/>


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