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<b>consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="osalg_2.html#NM3">OSSubAlgebra</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>
<b>take </b>
<font color="Maroon">c<sub>3</sub></font>
;<br/>

<b>thus </b><a NAME="E2:20_1_1"/>
<font color="Maroon">c<sub>3</sub></font> is <a href="osalg_1.html#V13">monotone</a>
 <b>by </b><i><a class="ref" href="osalg_3.html#T15" target="_self">Th15</a></i>;<br/>


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