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<b>let </b><font color="Maroon">k</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">d</font> be  non <a href="xboole_0.html#V1">zero</a>  <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">G</font> be    <a href="chain_1.html#M1" target="_self">Grating</a> of <font color="Maroon">d</font>;<br/><b>let </b><font color="Maroon">A</font> be   <a href="chain_1.html#NM3">Cell</a> of <font color="Maroon">k</font>,<font color="Maroon">G</font>;<br/><b>let </b><font color="Maroon">C</font> be   <a href="chain_1.html#NM4">Chain</a> of <span class="p1">(<span class="default"><font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1</span>)</span>,<font color="Maroon">G</font>;<br/>









<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[  <a href="chain_1.html#NM3">Cell</a> of <font color="Maroon">k</font>,<font color="Maroon">G</font>] <b>means </b>( <font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1 <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">d</font> &amp; not  <a href="card_1.html#K4">card</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="chain_1.html#K10" target="_self">star</a> <font color="Maroon">a<sub>1</sub></font></span>)</span> <a href="subset_1.html#K9">/\</a> <font color="Maroon">C</font></span>)</span> is <a href="abian.html#V1">even</a> );<br/>
<a NAME="E1:80"/><i><font color="Green">E37</font></i>: 
 <a href="chain_1.html#K11" target="_self">del</a> <font color="Maroon">C</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">A'</font> where <font color="Olive">A'</font> is   <a href="chain_1.html#NM3">Cell</a> of <font color="Maroon">k</font>,<font color="Maroon">G</font> : <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">A'</font>] </span>}</span> 
 
;<br/>
<b>thus </b><a NAME="E2:80"/>
( <font color="Maroon">A</font> <a href="hidden.html#R2">in</a>  <a href="chain_1.html#K11" target="_self">del</a> <font color="Maroon">C</font> iff <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">A</font>] )
 <b>from </b><i><a class="ref" href="lmod_7.html#S7">LMOD_7:sch 7</a>();</i><br/>


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