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<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:29_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="partit1.html#K1" target="_self">PARTITIONS</a> <font color="Maroon">Y</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">x</font> = <font color="Maroon">x</font> as    <a href="eqrel_1.html#M1">a_partition</a> of <font color="Maroon">Y</font> <b>by </b><i/>;<br/>
<b>take </b>
 <a href="partit1.html#K4" target="_self">ERl</a> <font color="Maroon">x</font>
;<br/>

<b>thus </b><a NAME="E3:29_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">x</font>, <a href="partit1.html#K4" target="_self">ERl</a> <font color="Maroon">x</font>]
 ;<br/>


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