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<b>consider </b><font color="Maroon">e</font> being    <a href="functor3.html#M1" target="_self">natural_equivalence</a> of <font color="Maroon">F</font>,<font color="Maroon">F</font>;<br/>
<a NAME="E2:60_1_1"/>
<font color="Maroon">e</font> <a href="functor2.html#K5">`*`</a> <span class="p1">(<span class="default"><font color="Maroon">e</font> <a href="functor3.html#K8" target="_self">"</a> </span>)</span> <a href="pboole.html#R6">=</a>  <a href="functor2.html#K4">idt</a> <font color="Maroon">F</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:60_1_1"/>
 <a href="functor2.html#K1">idt</a> <font color="Maroon">F</font> is    <a href="functor3.html#M1" target="_self">natural_equivalence</a> of <font color="Maroon">F</font>,<font color="Maroon">F</font>
 <b>by </b><i/>;<br/>


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