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