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I've seen the "Nuts" puzzle; I think it is indeed "Drive you nuts",

but I'm not sure. I seem to recall that not every (any?) piece

had all six numbers on it; that is, I think one or more numbers

were duplicated on one or more pieces. This of course opens up

the search space even more in trying to find a set of pieces with

exactly one solution. Also, rather than consider which sets

of pieces (or what fraction of possible sets of pieces) have unique

solutions, I think it makes more sense to choose a solution and see

how likely it is that the pieces forming that solution have another

solved orientation (other than trivial rotations of the whole puzzle).

That way you at least eliminate all the sets that have NO solution.

-- Don.