2 <area shape="rect" id="node4" href="$class_c.html" title="C" alt="" coords="42,260,81,287"/>
3 <area shape="rect" id="node2" href="$class_a.html" title="A" alt="" coords="34,5,73,32"/>
4 <area shape="rect" id="node3" href="$class_b.html" title="B" alt="" coords="34,95,73,121"/>