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Worms Sudoku
The numbers 1--9 must each appear exactly once in each row, column, and block. In addition, each worm should consist of an increasing sequence of numbers from tail to head. For example, a worm of length four could contain the numbers 2, 5, 6, and 8, in that order from tail to head. You have to figure out for each worm which end is the head and which is the tail.
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