<map id="A" name="A">
<area shape="rect" id="node1" title=" " alt="" coords="36,5,75,32"/>
<area shape="rect" id="node2" href="$class_c.html" title=" " alt="" coords="5,80,44,107"/>
<area shape="rect" id="node3" href="$class_d.html" title=" " alt="" coords="68,80,107,107"/>
<area shape="rect" id="node4" href="$class_e.html" title=" " alt="" coords="68,155,107,181"/>
</map>
