lass="o">=</span> <span class="n">T2</span><span class="o">.</span><span
            class="n">last</span>
    <span class="n">T1</span><span class="p">,</span> <span class="n">T2</span> <span class="o">=</span> <span
            class="n">T1</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span
            class="n">T2</span><span class="o">.</span><span class="n">root</span>
    <span class="c1"># We get the right most leaf of T1</span>
    <span class="n">rl</span> <span