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<b>consider </b><font color="Maroon">R</font> being  <a href="osalg_4.html#V3" target="_self">monotone</a> <a href="osalg_4.html#NM4">OSCongruence</a> of <font color="Maroon">U1</font>;<br/>
<b>take </b>
<font color="Maroon">R</font>
;<br/>

<b>thus </b><a NAME="E2:63_1_1"/>
<font color="Maroon">R</font> is <a href="osalg_4.html#V3" target="_self">monotone</a>
 ;<br/>


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