| digraph { | |
| label="Predecessors"; | |
| r -> a [dir = "back"]; | |
| r -> b [dir = "back"]; | |
| a -> c [dir = "back"]; | |
| b -> c [dir = "back"]; | |
| b -> d [dir = "back"]; | |
| c -> d [dir = "back"]; | |
| d -> b [dir = "back"]; | |
| d -> e [dir = "back"]; | |
| d -> f [dir = "back"]; | |
| e -> g [dir = "back"]; | |
| f -> g [dir = "back"]; | |
| { rank=same; r } | |
| { rank=same; a; b } | |
| { rank=same; c; d } | |
| { rank=same; e; f } | |
| { rank=same; g } | |
| } |