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<b>take </b>
 <a href="xboole_0.html#K1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:16_1_1"/>
(  <a href="xboole_0.html#K1">{}</a>  is    <a href="margrel1.html#M2" target="_self">relation</a> of <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="xboole_0.html#K1">{}</a>  is    <a href="margrel1.html#M1" target="_self">relation_length</a> of <font color="Maroon">c<sub>2</sub></font> )
 <b>by </b><i><a class="ref" href="margrel1.html#T20" target="_self">Th20</a>, <a class="ref" href="margrel1.html#T21" target="_self">Th21</a></i>;<br/>


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