0 5 1
1 6 2
2 10 5
5 2 0
5 7 4
4 12 7
4 5 6
6 5 4
5 4 3
2 3 3
each node has at most 2 child nodes, the nodes are unweighted and directional
mouse -> fox -> cat -> dog
mouse -> fox -> goat
but can yours work on a reciet role
ed was made for running on paper teletypes
and all of original unix was made with it
emacs wasnt a thing until 85