I pushed some more changes.
-- All automata code is now in the automata modules.
-- It is now easy to explore different implementations of automata.
1. Eliminating your last side-effects came for free or possibly a small gain in
performance.
2. Replacing your list-based automata with automata that use a transition
matrix was the real gain,
but of course this transformation reduces generality.
Right now, the code uses about 1/6 of the time your original program consumed.
This measurement is extremely rough and probably wouldn't stand up to
statistically
rigorous methods. Close enough.
I may try to add types later today.
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