">(</span><span class="n">itemset</span><span class="p">)</span> <span class="o">-</span> <span class="nb">len</span><span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="o">&amp;</span> <span class="nb">set</span><span class="p">(</span><span class="n">itemset</span><span class="p">)))</span> <span class="o">&lt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_faultTolerance</span><span class="p"