5 N1 [label="A: v.store(1, seq-cst)", shape=none];
6 N2 [label="X: fence(seq-cst)", shape=none];
7 N3 [label="B: v.store(2)", shape=none];
8 N4 [label="Y: v.load()", shape=none];
10 //N1 -> N3 [label="mo", color="#00aa00", style=dashed, penwidth=3];
11 N1 -> N2 [label="sc", color=purple];
12 N2 -> N4 [label="sb", color=blue, weight=100];
13 N3 -> N4 [label="rf", color=red];
14 N1 -> N3 [style=invis];