="keyword">val</span> exp : <span>(<a href="argument-1-B/index.html#type-t">B.t</a> * <a href="argument-1-B/index.html#type-t">B.t</a>)</span> <span>&#45;&gt;</span> <a href="argument-1-B/index.html#type-t">B.t</a> * <a href="argument-1-B/index.html#type-t">B.t</a></code></dt><dt class="spec value" id="val-ln"><a href="#val-ln" class="anchor"></a><code><span class="keyword">val</span> ln : <span>(<a href="argument-1-B/index.html#type-t">B.t</a> * <a href="argument-1-B/index.html#type-t">B.t</a>)</span> <spa