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<b>consider </b><font color="Maroon" title="c3">U2</font> being   <a href="osalg_2.html#NM3" title="OSALG_2:NM.3">OSSubAlgebra</a> of <font color="Maroon" title="c2">U1</font>;<br/>
<b>take </b>
<font color="Maroon" title="c3">U2</font>
;<br/>

<b>thus </b><a NAME="E2:20_1_1"/>
<font color="Maroon" title="c3">U2</font> is <a href="osalg_1.html#V13" title="OSALG_1:attr.13">monotone</a>
 <b>by </b><i><a class="ref" href="osalg_3.html#T15" target="_self" title="OSALG_3:th.15">Th15</a></i>;<br/>


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