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<b>consider </b><font color="Maroon">x</font> being  <a href="msualg_1.html#V4">strict</a> <a href="osalg_2.html#NM3">OSSubAlgebra</a> of <font color="Maroon">U0</font>;<br/>
<a NAME="E2:72_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="osalg_2.html#K12" target="_self">OSSub</a> <font color="Maroon">U0</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:72_1_1"/>
not  <a href="osalg_2.html#K12" target="_self">OSSub</a> <font color="Maroon">U0</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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