class="sa">f</span><span class="s1">&#39;MergeTree with </span><span class="si">{</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">nodes</span><span class="p">)</span><span class="si">}</span><span class="s1"> nodes and </span><span class="si">{</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">edges</span><span class="p">)</span><span class="si">}</span><spa