digraph g { "1" -> "6" [label="op",arrowhead=normal] "1" -> "4" [label="op",arrowhead=normal] "1" -> "2" [label="op",arrowhead=normal] "2" -> "1" [label="op",arrowhead=normal] "2" -> "5" [label="op",arrowhead=normal] "2" -> "3" [label="op",arrowhead=normal] "3" -> "2" [label="op",arrowhead=normal] "3" -> "6" [label="op",arrowhead=normal] "3" -> "4" [label="op",arrowhead=normal] "4" -> "3" [label="op",arrowhead=normal] "4" -> "1" [label="op",arrowhead=normal] "4" -> "5" [label="op",arrowhead=normal] "5" -> "6" [label="op",arrowhead=normal] "5" -> "4" [label="op",arrowhead=normal] "5" -> "2" [label="op",arrowhead=normal] "6" -> "1" [label="op",arrowhead=normal] "6" -> "3" [label="op",arrowhead=normal] "6" -> "5" [label="op",arrowhead=normal] }