working version

[SVN r9332]

example/scc.dot

@@ -2,14 +2,32 @@
 digraph SCC {
  node[shape=circle];
  ratio=1.2
- a b c d e f g h i j
- a -> { b f h }
- b -> { c a }
- c -> { d b }
+ a
+ b
+ c
+ d
+ e
+ f
+ g
+ h
+ i
+ j
+
+ a -> b
+ a -> f
+ a -> h
+ b -> c 
+ b -> a
+ c -> d 
+ c -> b
  d -> e
  e -> d
  f -> g
- g -> { f d }
+ g -> f
+ g -> d
  h -> i
- i -> { h j e c }
+ i -> h
+ i -> j
+ i -> e
+ i -> c
 }