><span class="def"><code><span class="keyword">include</span> <a href="../../../../../Interface/index.html#module-type-HEYTING_ALGEBRA">Interface.HEYTING_ALGEBRA</a></code></span></summary><div><div class="spec include"><div class="doc"><details open="open"><summary><span class="def"><code><span class="keyword">include</span> <a href="../../../../../Interface/index.html#module-type-ORD">Interface.ORD</a></code></span></summary><div><div class="spec include"><div class="doc"><details open="open"><summary><sp