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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" title="REALSET1:attr.1">trivial</a>
 <b>by </b><i><a class="ref" href="nat_2.html#D1" target="_self" title="NAT_2:def.1">Def1</a></i>;<br/>


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