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<b>let </b><font color="Maroon">A</font> be   <a href="cat_1.html#NM4">Category</a>;<br/>

<b>take </b>
 <a href="cat_1.html#K15">id</a> <font color="Maroon">A</font>
;<br/>

<b>take </b>
 <a href="cat_1.html#K15">id</a> <font color="Maroon">A</font>
;<br/>

<b>thus </b><a NAME="E1:55_1_1"/>
( <span class="p1">(<span class="default"><a href="cat_1.html#K15">id</a> <font color="Maroon">A</font></span>)</span> <a href="cat_1.html#K14">*</a> <span class="p1">(<span class="default"><a href="cat_1.html#K15">id</a> <font color="Maroon">A</font></span>)</span> <a href="nattra_1.html#NR4" target="_self">~=</a>  <a href="cat_1.html#K15">id</a> <font color="Maroon">A</font> &amp; <span class="p1">(<span class="default"><a href="cat_1.html#K15">id</a> <font color="Maroon">A</font></span>)</span> <a href="cat_1.html#K14">*</a> <span class="p1">(<span class="default"><a href="cat_1.html#K15">id</a> <font color="Maroon">A</font></span>)</span> <a href="nattra_1.html#NR4" target="_self">~=</a>  <a href="cat_1.html#K15">id</a> <font color="Maroon">A</font> )
 <b>by </b><i/>;<br/>


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