"><span class="constructor">Format</span></code></a>.<br>
<br>
Format strings have a general and highly polymorphic type
    <code class="code">(<span class="keywordsign">'</span>a, <span class="keywordsign">'</span>b, <span class="keywordsign">'</span>c, <span class="keywordsign">'</span>d, <span class="keywordsign">'</span>e, <span class="keywordsign">'</span>f) format6</code>.
    The two simplified types, <code class="code">format</code> and <code class="code">format4</code> below are
    included for b