New puzzle in 'unfinished'. Essentially, Sudoku for group theorists:

you are given a partially specified Cayley table of a small finite
group, and must fill in all the missing entries using both Sudoku-
style deductions (minus the square block constraint) and the group
axioms. I've just thrown it together in about five hours by cloning-
and-hacking from Keen, as much as anything else to demonstrate that
the new latin.c interface really does make it extremely easy to
write new Latin square puzzles.

It's not really _unfinished_, as such, but it is just too esoteric
(not to mention difficult) for me to feel entirely comfortable with
adding it to the main puzzle collection. I can't bring myself to
throw it away, though, and who knows - perhaps a university maths
department might find it a useful teaching tool :-)

[originally from svn r8800]

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