oduct of two lists</p></dd></dl><dl><dt class="spec value" id="val-and*"><a href="#val-and*" class="anchor"></a><code><span class="keyword">val</span> and* : <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> list</span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span> * <span class="type-var">'b</span>)</span> <a href="index.html#type-t">t</a></span></code></dt><dd><p>Monadic merge. <code>let* x =