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<b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be  <a href="cat_1.html#V1">strict</a>  <a href="index_1.html#M4" target="_self">TargetCat</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:47_1_1"/><i><font color="Green">E21</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being   <a href="index_1.html#M4" target="_self">TargetCat</a> of <font color="Maroon">c<sub>2</sub></font> holds <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_5.html#K7">Image</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Olive">b<sub>1</sub></font></span>)</span>
 <b>and </b><br/><a NAME="E2:47_1_1"/><i><font color="Green">E22</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being   <a href="index_1.html#M4" target="_self">TargetCat</a> of <font color="Maroon">c<sub>2</sub></font> holds <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_5.html#K7">Image</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Olive">b<sub>1</sub></font></span>)</span>
 ;<br/>

<b>consider </b><font color="Maroon">c<sub>5</sub></font> being    <a href="index_1.html#M4" target="_self">TargetCat</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>
<b>thus </b><font color="Maroon">c<sub>3</sub></font> = 
 <a href="cat_5.html#K7">Image</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>5</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="index_1.html#E1:47_1_1"><i><font color="Green">E21</font></i></a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="txt" href="index_1.html#E2:47_1_1"><i><font color="Green">E22</font></i></a></i>
;<br/>


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