>.</span><span class="n">merge</span><span class="p">(</span><span class="n">ela</span><span class="p">,</span> <span class="n">on</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;dbn&quot;</span><span class="p">,</span> <span class="s2">&quot;ay&quot;</span><span class="p">])</span><span class="o">.</span><span class="n">head</span><span class="p">()</span>
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