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<b>thus </b><a NAME="E1:30_1_1"/>
 <a href="funct_2.html#K6">pr2</a> <font color="Maroon">c<sub>2</sub></font> is   <a href="funct_2.html#NM1">Function</a> of  <a href="numbers.html#K5">NAT</a> , <a href="numbers.html#K5">NAT</a> 
 ;<br/>


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