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<b>let </b><font color="Maroon">p</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/><b>let </b><font color="Maroon">q</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="zf_lang.html#NM1">Variable</a>;<br/><b>let </b><font color="Maroon">y</font> be   <a href="zf_lang.html#NM1">Variable</a>;<br/><b>let </b><font color="Maroon">z</font> be   <a href="zf_lang.html#NM1">Variable</a>;<br/><b>let </b><font color="Maroon">t</font> be   <a href="zf_lang.html#NM1">Variable</a>;<br/><b>let </b><font color="Maroon">s</font> be   <a href="zf_lang.html#NM1">Variable</a>;<br/>













<a NAME="E1:12"/>
 <a href="zf_lang.html#K16">All</a> <font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">p</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K14">All</a> <font color="Maroon">x</font>,<font color="Maroon">y</font>,<span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">z</font>,<font color="Maroon">p</font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E2:12"/>
(  <a href="zf_lang.html#K16">All</a> <font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>,<font color="Maroon">p</font> <a href="hidden.html#R1">=</a>  <a href="zf_lang.html#K14">All</a> <font color="Maroon">t</font>,<font color="Maroon">s</font>,<font color="Maroon">q</font> implies ( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t</font> &amp; <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">s</font> &amp;  <a href="zf_lang.html#K8">All</a> <font color="Maroon">z</font>,<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">q</font> ) )
 <b>by </b><i/>;<br/>


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