pan>a,&nbsp;<span class="keywordsign">'</span>b,&nbsp;<span class="keywordsign">'</span>c,&nbsp;<span class="keywordsign">'</span>d,&nbsp;<span class="keywordsign">'</span>e,&nbsp;<span class="keywordsign">'</span>f)&nbsp;format6&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string<br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;format_of_string&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;(<span class="keywordsign">'</span>a,&nbsp;<span class="keywordsign">'</span>b,&nbsp;<span class="keywordsign">'</s