ass="anchor"></a><code><span class="keyword">module</span> <a href="I/index.html">I</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><dl><dt class="spec value" id="val-bicommutativity"><a href="#val-bicommutativity" class="anchor"></a><code><span class="keyword">val</span> bicommutativity : <a href="../argument-1-M/index.html#type-t">M.t</a> <span>&#45;&gt;</span> <a href="../argument-1-M/index.html#type-t">M.t</a> <span>&#45;&gt;</span> <a href="../argument-1-M/index.