</span>&nbsp;fst&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;*&nbsp;<span class="keywordsign">'</span>b&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;=&nbsp;<span class="string">"%field0"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;snd&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;*&nbsp;<span class="keywordsign">'</span>b&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>b&nbsp;=&nbsp;<span cl