bsp;=&nbsp;<span class="string">"%sequor"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;(&nbsp;<span class="keywordsign">~-</span>&nbsp;)&nbsp;:&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"%negint"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;(&nbsp;<span class="keywordsign">~+</span>&nbsp;)&nbsp;:&nbsp;int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"%identity"</span><br>
&