n>
<span class="sd">        performs prefix equivalence to form the combinations and generates partial-periodic patterns.</span>
<span class="sd">        :return: None</span>

<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mine</span><span class="p">()</span></div>

    <span class="k">def</span> <span class="nf">_getPerSup</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">arr</sp