digraph g { "a" -> "b" [label="op",arrowhead=normal] "a" -> "c" [label="op",arrowhead=normal] "a" -> "d" [label="op",arrowhead=normal] "b" -> "a" [label="op",arrowhead=normal] "b" -> "e" [label="op",arrowhead=normal] "b" -> "i" [label="op",arrowhead=normal] "c" -> "a" [label="op",arrowhead=normal] "c" -> "e" [label="op",arrowhead=normal] "c" -> "f" [label="op",arrowhead=normal] "d" -> "a" [label="op",arrowhead=normal] "d" -> "f" [label="op",arrowhead=normal] "d" -> "j" [label="op",arrowhead=normal] "e" -> "b" [label="op",arrowhead=normal] "e" -> "c" [label="op",arrowhead=normal] "e" -> "g" [label="op",arrowhead=normal] "f" -> "c" [label="op",arrowhead=normal] "f" -> "d" [label="op",arrowhead=normal] "f" -> "h" [label="op",arrowhead=normal] "g" -> "e" [label="op",arrowhead=normal] "g" -> "i" [label="op",arrowhead=normal] "g" -> "h" [label="op",arrowhead=normal] "h" -> "g" [label="op",arrowhead=normal] "h" -> "f" [label="op",arrowhead=normal] "h" -> "j" [label="op",arrowhead=normal] "i" -> "b" [label="op",arrowhead=normal] "i" -> "g" [label="op",arrowhead=normal] "i" -> "j" [label="op",arrowhead=normal] "j" -> "i" [label="op",arrowhead=normal] "j" -> "h" [label="op",arrowhead=normal] "j" -> "d" [label="op",arrowhead=normal] }