c-frequent patterns.</span>

<span class="sd">        :param prefix:  main equivalence prefix</span>
<span class="sd">        :type prefix: periodic-frequent item or pattern</span>
<span class="sd">        :param itemSets: patterns which are items combined with prefix and satisfying the periodicity and frequent with their timestamps</span>
<span class="sd">        :type itemSets: list</span>
<span class="sd">        :param tidSets: timestamps of the items in the argument itemSets</span>
<span class="sd">   