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<b>let </b><font color="Maroon">x</font> be  <a href="comput_1.html#V2" target="_self">from-natural-fseqs</a> <a href="funct_1.html#NM1">Function</a>;<br/>

<b>assume </b><a NAME="E1:140_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="comput_1.html#K11" target="_self">PrimRec</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="comput_1.html#D19" target="_self">COMPUT_1:def 19</a><br/>

<a NAME="E2:140_1_1"/><b>then </b>
<font color="Maroon">x</font> is    <a href="comput_1.html#M1" target="_self">Element</a> of  <a href="comput_1.html#K11" target="_self">PrimRec</a> 
 
;<br/>
<b>hence </b><a NAME="E3:140_1_1"/>
<font color="Maroon">x</font> is <a href="comput_1.html#V3" target="_self">len-total</a>
 ;<br/>


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