     :type tidSets: list</span>

<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">itemSets</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
            <span class="n">i</span> <span class="o">=</span> <span class="n">itemSets</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
            <span class="n">tidI</span> <spa