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<b>take </b>
2
;<br/>

<b>thus </b><a NAME="E1:30_2_1"/>
( not 2 is <a href="realset1.html#V1">trivial</a> &amp; 2 is <a href="ordinal1.html#V7">natural</a> )
 <b>by </b><i/>;<br/>


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