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<b>take </b>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:16_1_1"/>
(  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is    <a href="margrel1.html#M2" title="MARGREL1:mode.2">relation</a> of <font color="Maroon" title="c1">X</font> &amp;  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is    <a href="margrel1.html#M1" title="MARGREL1:mode.1">relation_length</a> of <font color="Maroon" title="c2">k</font> )
 <b>by </b><i><a class="ref" href="margrel1.html#T20" target="_self" title="MARGREL1:th.20">Th20</a>, <a class="ref" href="margrel1.html#T21" target="_self" title="MARGREL1:th.21">Th21</a></i>;<br/>


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