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The Challenger puzzle can be found syndicated in various newspapers (The Toronto Star for example). It involves filling in the entries of a 4 by 4 grid with integers between 1 and 9 so that all columns rows and diagonals add up to numbers given in the puzzle. Some of the numebrs are already filled in the grid so these act as a constraint on the other solutions. Write a procedure which will solve any Challenger puzzle. Remember that the solutions can only be integers between 1 and 9.

Juris Steprans
Thu Mar 27 17:07:46 EST 1997