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<b>consider </b><font color="Maroon">A</font> being  <a href="msualg_1.html#V5">non-empty</a>  <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">S</font>;<br/>
<b>take </b>
<font color="Maroon">A</font>
;<br/>

<b>thus </b><a NAME="E2:8_1_1"/>
<font color="Maroon">A</font> is <a href="msualg_1.html#V5">non-empty</a>
 ;<br/>


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