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Copperbox revision 470.

I've added shift and reset to the parse monad. Well I think I have - the definitions type check and don't have any undefined's, but they are pretty far out. My test example works though it doesn't alter the state, which is the main doubt I have with the implementation. Also programming with shift and reset is hard work in Haskell (compared to say, Scheme) because you're already in a CPS monad, so I don't know if it will be very useful.

Still it was a fairly tough mental challenge to go so far, coding as sudoku.