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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="midsp_1.html#NM1">MidSp</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>









<b>assume </b><a NAME="E1:39"/>
<span class="p1"><a href="midsp_1.html#K7" target="_self">[</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="midsp_1.html#K7" target="_self">]</a></span> <a href="midsp_1.html#K8" target="_self">~</a>  <a href="hidden.html#R1">=</a> <span class="p1"><a href="midsp_1.html#K7" target="_self">[</a><span class="default"><font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font></span><a href="midsp_1.html#K7" target="_self">]</a></span> <a href="midsp_1.html#K8" target="_self">~</a> 
 ;<br/>

<a NAME="E2:39"/><b>then </b>
<span class="p1"><a href="midsp_1.html#K7" target="_self">[</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="midsp_1.html#K7" target="_self">]</a></span> <a href="midsp_1.html#R2" target="_self">##</a> <span class="p1"><a href="midsp_1.html#K7" target="_self">[</a><span class="default"><font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font></span><a href="midsp_1.html#K7" target="_self">]</a></span>
 
<b>by </b><i><a class="ref" href="midsp_1.html#T43" target="_self">Th43</a></i>;<br/>
<a NAME="E3:39"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="midsp_1.html#R1" target="_self">@@</a> <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="ref" href="midsp_1.html#T32" target="_self">Th32</a></i>;<br/>
<b>hence </b><a NAME="E4:39"/>
<font color="Maroon">c<sub>2</sub></font> <a href="midsp_1.html#K4" target="_self">@</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> <a href="midsp_1.html#K4" target="_self">@</a> <font color="Maroon">c<sub>4</sub></font>
 <b>by </b><i><a class="ref" href="midsp_1.html#D5" target="_self">Def5</a></i>;<br/>


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