n class="p">(</span><span class="n">collection</span><span class="p">):</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_equiv</span><span class="p">(</span><span class="n">e</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">i</span>
    <span class="k">return</span> 

</div>
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