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<b>consider </b><font color="Maroon">F</font> being   <a href="zf_lang.html#NM2">ZF-formula</a>, <font color="Maroon">G</font> being   <a href="zf_lang.html#NM2">ZF-formula</a><b> such that </b><br/><a NAME="E2:64_2_1"/><i><font color="Green">E32</font></i>: 
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="zf_lang.html#K12" target="_self">&lt;=&gt;</a> <font color="Maroon">G</font>
 <b>by </b><i>, </i>;<br/>
<b>take </b>
<font color="Maroon">G</font>
;<br/>

<b>take </b>
<font color="Maroon">F</font>
;<br/>

<b>thus </b><a NAME="E3:64_2_1"/>
<font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="zf_lang.html#K12" target="_self">&lt;=&gt;</a> <font color="Maroon">G</font>
 <b>by </b><i/>;<br/>


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