digraph g { "A" -> "B" [label="op",arrowhead=normal] "A" -> "C" [label="op",arrowhead=normal] "A" -> "G" [label="op",arrowhead=normal] "B" -> "A" [label="op",arrowhead=normal] "B" -> "D" [label="op",arrowhead=normal] "B" -> "H" [label="op",arrowhead=normal] "C" -> "A" [label="op",arrowhead=normal] "C" -> "D" [label="op",arrowhead=normal] "C" -> "E" [label="op",arrowhead=normal] "D" -> "C" [label="op",arrowhead=normal] "D" -> "F" [label="op",arrowhead=normal] "D" -> "B" [label="op",arrowhead=normal] "E" -> "C" [label="op",arrowhead=normal] "E" -> "F" [label="op",arrowhead=normal] "E" -> "G" [label="op",arrowhead=normal] "F" -> "E" [label="op",arrowhead=normal] "F" -> "D" [label="op",arrowhead=normal] "F" -> "H" [label="op",arrowhead=normal] "G" -> "A" [label="op",arrowhead=normal] "G" -> "E" [label="op",arrowhead=normal] "G" -> "H" [label="op",arrowhead=normal] "H" -> "G" [label="op",arrowhead=normal] "H" -> "F" [label="op",arrowhead=normal] "H" -> "B" [label="op",arrowhead=normal] }