5 N1 [label="A: v.store(1)", shape=none];
6 //N2 [style=invis, shape=dot];
7 N3 [label="B: v.store(2)", shape=none];
8 //N4 [style=invis, shape=dot];
10 N1 -> N3 [label="mo", color="#00aa00", style=dashed, penwidth=3];
11 //N1 -> N2 [label="sb", color=blue];
12 //N2 -> N4 [label="sc", color=purple];
13 //N2 -> N3 [style=invis];
14 //N3 -> N4 [label="rf", color=red];