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<b>let </b><font color="Maroon">A</font> be  non <a href="struct_0.html#V3">empty</a> <a href="altcat_1.html#V2">transitive</a> <a href="altcat_1.html#V12">with_units</a>  <a href="altcat_1.html#L2">AltCatStr</a> ;<br/>

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

<b>thus </b><a NAME="E1:123_1_1"/>
(  <a href="functor0.html#K12" target="_self">id</a> <font color="Maroon">A</font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp;  <a href="functor0.html#K12" target="_self">id</a> <font color="Maroon">A</font> is <a href="functor0.html#V15" target="_self">covariant</a> )
 ;<br/>


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