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<div><span class="kw">theorem </span><a NAME="T18"><span class="comment"><font color="firebrick">:: NUMBER14:18</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">i</font>, <font color="Olive" title="b2">j</font> being   <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a>  st <font color="Olive" title="b1">i</font>,<font color="Olive" title="b2">j</font> <a href="int_1.html#R2" title="INT_1:pred.2">are_congruent_mod</a> 2 holds <br/>( <font color="Olive" title="b1">i</font> is  <a href="abian.html#V1" title="ABIAN:attr.1">even</a>  iff <font color="Olive" title="b2">j</font> is  <a href="abian.html#V1" title="ABIAN:attr.1">even</a>  ) ;<br/></div></div>
