data: list</span>

<span class="sd">        :param secondary: The set of secondary items</span>

<span class="sd">        :type secondary: set</span>

<span class="sd">        :return:</span>

<span class="sd">            projected_db (dict):</span>
<span class="sd">                The projected database.</span>
<span class="sd">            local_utils (dict):</span>
<span class="sd">                The local utilities of the projected database.</span>
<span class="sd">            subtree_utils (dict):</spa