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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <a href="midsp_1.html#K3" target="_self">Example</a> ;<br/>

<b>thus </b><font color="Maroon">c<sub>1</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>1</sub></font> = 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
<br/>.= 
<font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
;<br/>

<b>thus </b><font color="Maroon">c<sub>1</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>2</sub></font> = 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
<br/>.= 
<font color="Maroon">c<sub>2</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
;<br/>

<b>thus </b><span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="midsp_1.html#K1" target="_self">@</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> = 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="midsp_1.html#K1" target="_self">@</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
;<br/>

<b>take </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><font color="Maroon">c<sub>5</sub></font> <a href="midsp_1.html#K1" target="_self">@</a> <font color="Maroon">c<sub>1</sub></font> = 
 <a href="xboole_0.html#K1">{}</a> 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
<br/>.= 
<font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>
;<br/>


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