/a><code><span><span class="keyword">and</span> register</span><span> = <span><span><a href="#type-t">t</a> list</span> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> list</span></span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-label"><a href="#type-label" class="anchor"></a><code><span><span class="keyword">and</span> label</span><span> = string * <span><a href="#type-t">t</a> list</span></span></code></div></div><div class="odoc-spec"><div