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<b>let </b><font color="Maroon" title="c9">l1</font>, <font color="Maroon" title="c10">l2</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:18_1_2"/><i><font color="Green" title="E17">A3</font></i>: 
for <font color="Olive" title="b1">l</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>  st <font color="Maroon" title="c6">a</font> <a href="symsp_1.html#NR1" title="SYMSP_1:NR.1">_|_</a>  holds <br/><font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">l</font>
 <b>and </b><br/><a NAME="E2:18_1_2"/><i><font color="Green" title="E18">A4</font></i>: 
for <font color="Olive" title="b1">l</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font>  st <font color="Maroon" title="c6">a</font> <a href="symsp_1.html#NR1" title="SYMSP_1:NR.1">_|_</a>  holds <br/><font color="Maroon" title="c10">l2</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">l</font>
 ;<br/>

<b>consider </b><font color="Maroon" title="c11">k</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c4">F</font><b> such that </b><br/><a NAME="E4:18_1_2"/><i><font color="Green" title="E19">A5</font></i>: 
<font color="Maroon" title="c6">a</font> <a href="symsp_1.html#NR1" title="SYMSP_1:NR.1">_|_</a> 
 <b>by </b><i><a class="txt" href="ortsp_1.html#E1:18"><i><font color="Green" title="E16">A1</font></i></a>, <a class="ref" href="ortsp_1.html#D2" target="_self" title="ORTSP_1:def.2">Def2</a></i>;<br/>
<a NAME="E5:18_1_2"/>
<font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c11">k</font>
 
<b>by </b><i><a class="txt" href="ortsp_1.html#E1:18_1_2"><i><font color="Green" title="E17">A3</font></i></a>, <a class="txt" href="ortsp_1.html#E4:18_1_2"><i><font color="Green" title="E19">A5</font></i></a></i>;<br/>
<b>hence </b><a NAME="E6:18_1_2"/>
<font color="Maroon" title="c9">l1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c10">l2</font>
 <b>by </b><i><a class="txt" href="ortsp_1.html#E2:18_1_2"><i><font color="Green" title="E18">A4</font></i></a>, <a class="txt" href="ortsp_1.html#E4:18_1_2"><i><font color="Green" title="E19">A5</font></i></a></i>;<br/>


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