n class="bp">self</span><span class="p">,</span> <span class="n">px</span><span class="p">:</span> <span class="n">_FFList</span><span class="p">,</span> <span class="n">py</span><span class="p">:</span> <span class="n">_FFList</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">_FFList</span><span class="p">:</span>
<span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        A function to construct a new Fuzzy item set from 2 fuzzy itemSets</sp