bsp;<span class="keywordsign">-&gt;</span>&nbsp;(<span class="keywordsign">'</span>a,&nbsp;<span class="keywordsign">'</span>b)&nbsp;<span class="constructor">Bpair</span>.t<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;map1&nbsp;:&nbsp;(<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>b)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;*&nbsp;<span class="keywordsign">'</span>c&nbsp;<span 