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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being  non <a href="struct_0.html#V3">empty</a> <a href="msualg_1.html#V1">strict</a> non <a href="msualg_1.html#V2">void</a> <a href="msualg_2.html#V2">all-with_const_op</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/>
<b>take </b>
 <a href="osalg_1.html#K2">OSSign</a> <font color="Maroon">c<sub>1</sub></font>
;<br/>

<b>thus </b><a NAME="E2:9_1_1"/>
(  <a href="osalg_1.html#K2">OSSign</a> <font color="Maroon">c<sub>1</sub></font> is <a href="msualg_2.html#V2">all-with_const_op</a> &amp;  <a href="osalg_1.html#K2">OSSign</a> <font color="Maroon">c<sub>1</sub></font> is <a href="osalg_1.html#V3">strict</a> )
 <b>by </b><i><a class="ref" href="osalg_2.html#T3" target="_self">Th3</a></i>;<br/>


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