;</span>&nbsp;<span class="keywordsign">'</span>c&nbsp;*&nbsp;<span class="keywordsign">'</span>b<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;(&nbsp;***&nbsp;)&nbsp;:&nbsp;(<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>c)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;(<span class="keywordsign">'</span>b&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>d)&nbsp;<span class="keywordsign">-&gt