><span class="p">)</span><span class="w">  </span><span class="kd">::</span><span class="w"> </span><span class="n">ia</span><span class="p">,</span><span class="w"> </span><span class="n">ib</span>
<span class="w">   </span><span class="n">lt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">merge</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"