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<b>consider </b><font color="Maroon">x</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><br/><a NAME="E2:14_1_1"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="urysohn1.html#K1" target="_self">dyadic</a> 0
 <b>by </b><i><a class="ref" href="xboole_0.html#D1">XBOOLE_0:def 1</a></i>;<br/>
<b>thus </b><a NAME="E3:14_1_1"/>
not  <a href="urysohn1.html#K2" target="_self">DYADIC</a>  is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i>, </i>;<br/>


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