 class="o">=</span> <span class="n">T1</span>
    <span class="k">while</span> <span class="n">rl</span><span class="o">.</span><span class="n">right</span><span
            class="p">:</span>
        <span class="n">rl</span> <span class="o">=</span> <span class="n">rl</span><span class="o">.</span><span
            class="n">right</span>

    <span class="c1"># We get the left most leaf of T2</span>
    <span class="n">ll</span> <span class="o">=</span> <span class="n">T2</span>
    <span class="k">while<