ode><span class="keyword">module</span> <span class="keyword">type</span> <a href="module-type-BIAPPLICATIVE/index.html">BIAPPLICATIVE</a> = <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module-type" id="module-type-BIFOLDABLE"><a href="#module-type-BIFOLDABLE" class="anchor"></a><code><span class="keyword">module</span> <span class="keyword">type</span> <a href="module-type-BIFOLDABLE/index.html">BIFOLDABLE</a> = <span class="keyword">sig</span> ... <spa