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<b>take </b>
0
;<br/>

<b>thus </b><a NAME="E1:2_1_1"/>
0 <a href="hidden.html#R2">in</a>  <a href="numbers.html#K6">ExtREAL</a> 
 <b>by </b><i><a class="ref" href="xboole_0.html#D2">XBOOLE_0:def 2</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="xxreal_0.html#D1" target="_self">XXREAL_0:def 1</a><br/>


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