1<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy"> 2<area shape="rect" id="node1" href="$classoperations__research_1_1_rev_bit_set.html" title="This class represents a reversible bitset." alt="" coords="5,5,92,32"/> 3<area shape="rect" id="node2" href="$classoperations__research_1_1_rev_bit_matrix.html" title="Matrix version of the RevBitSet class." alt="" coords="140,5,247,32"/> 4</map> 5