/span> <span class="o">+</span> <span class="n">prefix</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_Generation</span><span class="p">(</span><span class="n">newPrefix</span><span class="p">,</span> <span class="n">classItemSets</span><span class="p">,</span> <span class="n">classTidSets</span><span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_save</span><span class="p">(</span><span class="n">prefix</span><span