</summary><div><div class="spec include"><div class="doc"><details open="open"><summary><span class="def"><code><span class="keyword">include</span> <a href="../../../../Alg_structs/Semigroup/index.html#module-type-Seed">Alg_structs.Semigroup.Seed</a></code></span></summary><dl><dt class="spec type" id="type-t"><a href="#type-t" class="anchor"></a><code><span class="keyword">type</span> t</code></dt><dd><p>The principle (and sole) type.</p><p>We can think of this set-theoretically as the carrier set of the 