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<b>take </b>
 <a href="numbers.html#K5">NAT</a> 
;<br/>

<b>thus </b><a NAME="E1:52_1_1"/>
( not  <a href="numbers.html#K5">NAT</a>  is <a href="xboole_0.html#V1">empty</a> &amp;  <a href="numbers.html#K5">NAT</a>  is <a href="ordinal1.html#V3">ordinal</a> )
 ;<br/>


</div>
