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<span class="kw">take </span>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> (  <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> )</span><br/>

<span class="kw">thus </span><a NAME="E1:15_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> )
 <span class="kw">by</span> <span class="lab"><a class="ref" href="margrel1.html#T4" target="_self" title="MARGREL1:th.4">Th20</a>, <a class="ref" href="margrel1.html#T5" target="_self" title="MARGREL1:th.5">Th21</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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