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<b>let </b><font color="Maroon">L</font> be  non <a href="struct_0.html#V3">empty</a> <a href="sheffer2.html#V1" target="_self">satisfying_Sh_1</a>  <a href="sheffer1.html#L1">ShefferStr</a> ;<br/><b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>



<b>set </b><font color="Maroon">X</font> = <font color="Maroon">x</font>;<br/>
<b>set </b><font color="Maroon">Y</font> = <font color="Maroon">y</font>;<br/>
<a NAME="E1:46"/>
<font color="Maroon">y</font> <a href="sheffer1.html#K5">|</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="sheffer1.html#K5">|</a> <font color="Maroon">y</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="sheffer1.html#K5">|</a> <font color="Maroon">y</font></span>)</span> <a href="sheffer1.html#K5">|</a> <font color="Maroon">y</font>
 
<b>by </b><i><a class="ref" href="sheffer2.html#T6" target="_self">Th6</a></i>;<br/>
<b>hence </b><a NAME="E2:46"/>
<span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="sheffer1.html#K5">|</a> <font color="Maroon">y</font></span>)</span> <a href="sheffer1.html#K5">|</a> <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">y</font> <a href="sheffer1.html#K5">|</a> <span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="sheffer1.html#K5">|</a> <font color="Maroon">x</font></span>)</span>
 <b>by </b><i><a class="ref" href="sheffer2.html#T27" target="_self">Th27</a></i>;<br/>


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