p;(&nbsp;!=&nbsp;)&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool&nbsp;=&nbsp;<span class="string">"%noteq"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;not&nbsp;:&nbsp;bool&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bool&nbsp;=&nbsp;<span class="string">"%boolnot"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;(&nbsp;<span 