[Jprogramming] Programming Digest, Vol 78, Issue 50

[Raul Miller]

Try this:

Build a 2 dimensional matrix of boxes.

First dimension represents "starting" state for your directional arrow.

Second dimension represents "ending" state for your directional arrow.

Contents of each box is a list of the transitions relevant for that
state combination.

For invalid transitions, you would have an empty box.

-- 
Raul