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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be    <a href="filerec1.html#NM1" target="_self">File</a> of <font color="Maroon">D</font>, <font color="Maroon">CR</font> be    <a href="filerec1.html#NM1" target="_self">File</a> of <font color="Maroon">D</font>;<br/>



<a NAME="E1:42"/>
 <a href="finseq_8.html#K8">addcr</a> <font color="Maroon">f</font>,<font color="Maroon">CR</font> <a href="hidden.html#R1">=</a>  <a href="finseq_8.html#K4">ovlcon</a> <font color="Maroon">f</font>,<font color="Maroon">CR</font>
 
<b>by </b><i><a class="ref" href="finseq_8.html#D11">FINSEQ_8:def 11</a></i>;<br/>
<b>hence </b><a NAME="E2:42"/>
<font color="Maroon">CR</font> <a href="finseq_8.html#R2">is_substring_of</a>  <a href="finseq_8.html#K8">addcr</a> <font color="Maroon">f</font>,<font color="Maroon">CR</font>,1
 <b>by </b><i/>;<br/>


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