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<b>reconsider </b><font color="Maroon" title="c2">F1</font> = <a href="qc_lang1.html#K5" title="QC_LANG1:func.5">QC-pred_symbols</a>  <a href="margrel1.html#K1" title="MARGREL1:func.1">--&gt;</a> <span class="p1">(<span class="default"><a href="margrel1.html#K4" title="MARGREL1:func.4">empty_rel</a> <font color="Maroon" title="c1">D</font></span>)</span> as   <a href="funct_2.html#NM1" title="FUNCT_2:NM.1">Function</a> of  <a href="qc_lang1.html#K5" title="QC_LANG1:func.5">QC-pred_symbols</a> , <a href="margrel1.html#K3" title="MARGREL1:func.3">relations_on</a> <font color="Maroon" title="c1">D</font> ;<br/>
<b>take </b>
<font color="Maroon" title="c2">F1</font>
;<br/>

<b>let </b><font color="Maroon" title="c3">P</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="qc_lang1.html#K5" title="QC_LANG1:func.5">QC-pred_symbols</a> ;<br/>

<b>thus </b><a NAME="E2:12_1_1"/>
for <font color="Olive" title="b1">r</font> being   <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="margrel1.html#K3" title="MARGREL1:func.3">relations_on</a> <font color="Maroon" title="c1">D</font>  holds <br/>(  not <font color="Maroon" title="c2">F1</font> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <font color="Maroon" title="c3">P</font> <a href="margrel1.html#R1" title="MARGREL1:pred.1">=</a> <font color="Olive" title="b1">r</font> or <font color="Olive" title="b1">r</font> <a href="margrel1.html#R1" title="MARGREL1:pred.1">=</a>  <a href="margrel1.html#K4" title="MARGREL1:func.4">empty_rel</a> <font color="Maroon" title="c1">D</font> or  <a href="qc_lang1.html#K6" title="QC_LANG1:func.6">the_arity_of</a> <font color="Maroon" title="c3">P</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="margrel1.html#K5" title="MARGREL1:func.5">the_arity_of</a> <font color="Olive" title="b1">r</font> )
 <b>by </b><i><a class="ref" href="funcop_1.html#T13" title="FUNCOP_1:th.13">FUNCOP_1:13</a></i>;<br/>


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