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<b>thus </b><a NAME="E1:18_1_1"/>
 <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="nat_3.html#K2" target="_self">|^</a> <font color="Maroon">a</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="numbers.html#K5">NAT</a> 
 <b>by </b><i><a class="ref" href="seqm_3.html#D8">SEQM_3:def 8</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="finseq_1.html#D4">FINSEQ_1:def 4</a><br/>


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