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<b>take </b>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:64_1_1"/>
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is <a href="seqm_3.html#V6" title="SEQM_3:attr.6">natural-yielding</a>
 ;<br/>


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