>
        <span class="n">subtree</span> <span class="o">=</span> <span class="p">{}</span>
        <span class="n">filtered_transactions</span> <span class="o">=</span> <span class="p">{}</span>
        <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">file_data</span><span class="p">:</span>
            <span class="n">zipped</span> <span class="o">=</span> <span class="nb">zip</span><span class="p">(</span><span class="n">col</span><span class="p">[</span><s