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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> non <a href="msualg_1.html#V2">void</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/>
<b>take </b><font color="Maroon">c<sub>2</sub></font> =  <a href="osalg_1.html#K2" target="_self">OSSign</a> <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E2:21_1_1"/>
( <font color="Maroon">c<sub>2</sub></font> is <a href="orders_3.html#V1">discrete</a> &amp; <font color="Maroon">c<sub>2</sub></font> is <a href="osalg_1.html#V6" target="_self">op-discrete</a> )
 <b>by </b><i><a class="ref" href="osalg_1.html#T5" target="_self">Th5</a></i>;<br/>

<b>hence </b><a NAME="E3:21_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="osalg_1.html#V5" target="_self">discernable</a>
 <b>by </b><i><a class="ref" href="osalg_1.html#T4" target="_self">Th4</a></i>;<br/>


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