an class="keyword">let</span> m = <span class="constructor">PairsSet</span>.(empty |&gt; add (2,3) |&gt; add (5,7) |&gt; add (11,13))
   </code></pre>
<p>This creates a new module <code class="code"><span class="constructor">PairsSet</span></code>, with a new type <code class="code"><span class="constructor">PairsSet</span>.t</code>
   of sets of <code class="code">int&nbsp;*&nbsp;int</code>.</p>
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<pre><span id="MODULETYPEOrderedType"><span class="keyword">module type</span> 