--- /dev/null
+digraph rw_mo {
+margin=0;
+ranksep=.3;
+
+N1 [label="X: v.store(1)", shape=none];
+N2 [label="A: v.load()", shape=none];
+N3 [label="B: v.store(2)", shape=none];
+
+N2 -> N3 [label="hb", color=blue];
+N1 -> N2 [label="rf", color=red, constraint=false];
+}