Added the python-graph module http://code.google.com/p/python-graph/ Patch by: Sverre Rabbelier

Q 0 1 2 3
A a b
s 0
F 1 3
t a 0 1
t b 0 2
t a 1 3
t b 1 3
t a 2 0
t b 2 1
t a 3 2
t b 3 3