Layout is somewhat clunky... blame GraphViz

digraph Rev_with_hidden_class { pack="true";

subgraph label1 { A1 [color="red"]; C1 [color="red"]; G1 [color="red"]; U1 [color="red"]; A1 -> C1 [dir="both"]; A1 -> G1 [dir="both"]; A1 -> U1 [dir="both"];

C1 -> G1 [dir="both"]; C1 -> U1 [dir="both"];

G1 -> U1 [dir="both"]; }

subgraph label2 { A2 [color="blue"]; C2 [color="blue"]; G2 [color="blue"]; U2 [color="blue"]; A2 -> C2 [dir="both"]; A2 -> G2 [dir="both"]; A2 -> U2 [dir="both"];

C2 -> G2 [dir="both"]; C2 -> U2 [dir="both"];

G2 -> U2 [dir="both"]; }

A1 -> A2 [dir="both"]; C1 -> C2 [dir="both"]; G1 -> G2 [dir="both"]; U1 -> U2 [dir="both"];

};

-- IanHolmes - 06 Mar 2007