An interesting programming puzzle to chew on: look over John Baez’s posts on Network Theory. Learn some stuff on Petri nets (see also Azimuth project wiki on Petri nets!).
Deterministic Petri nets appear to resemble some simple model of computation.
Puzzle: Code up a Petri net simulator as a state Monad.
Don’t forget to make it extendible to a stochastic Petri net! And syntax highlighting for Haskell may help.
Remark. It seems that Python would be a nicer language to use; at least the code would resemble some structured English description of it! Although, you know LISP and nature…
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