n>&nbsp;<span class="keywordsign">'</span>b<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;map_snd&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>c&nbsp;*&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>b<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp