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<b>consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="altcat_1.html#NM1">object</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>
<b>consider </b><font color="Maroon">c<sub>4</sub></font> being   <a href="altcat_1.html#NM2">Morphism</a> of <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>3</sub></font>;<br/>
<b>take </b>
<font color="Maroon">c<sub>1</sub></font> <a href="functor0.html#K9" target="_self">--&gt;</a> <font color="Maroon">c<sub>4</sub></font>
;<br/>

<b>thus </b><a NAME="E3:49_1_1"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="functor0.html#K9" target="_self">--&gt;</a> <font color="Maroon">c<sub>4</sub></font> is <a href="functor0.html#V8" target="_self">feasible</a> &amp; <font color="Maroon">c<sub>1</sub></font> <a href="functor0.html#K9" target="_self">--&gt;</a> <font color="Maroon">c<sub>4</sub></font> is <a href="functor0.html#V10" target="_self">Covariant</a> &amp; <font color="Maroon">c<sub>1</sub></font> <a href="functor0.html#K9" target="_self">--&gt;</a> <font color="Maroon">c<sub>4</sub></font> is <a href="functor0.html#V11" target="_self">Contravariant</a> )
 ;<br/>


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