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<b>let </b><font color="Maroon">A</font> be   <a href="altcat_1.html#NM4">category</a>;<br/>

<b>take </b>
 <a href="functor0.html#K12">id</a> <font color="Maroon">A</font>
;<br/>

<b>take </b>
 <a href="functor0.html#K12">id</a> <font color="Maroon">A</font>
;<br/>

<b>thus </b><a NAME="E1:18_1_1"/>
( <span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">A</font></span>)</span> <a href="functor3.html#K1">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">A</font></span>)</span>, <a href="functor0.html#K12">id</a> <font color="Maroon">A</font> <a href="functor3.html#R1">are_naturally_equivalent</a>  &amp; <span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">A</font></span>)</span> <a href="functor3.html#K1">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">A</font></span>)</span>, <a href="functor0.html#K12">id</a> <font color="Maroon">A</font> <a href="functor3.html#R1">are_naturally_equivalent</a>  )
 <b>by </b><i><a class="ref" href="functor3.html#T4">FUNCTOR3:4</a></i>;<br/>


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