Fill the 4 x 4 grid with the digits 1, 2, 3 and 4. Each digit will appear only once in each row, column, and 2 x 2 sub-grid (“box”).
Example:

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Fill the 4 x 4 grid with the digits 1, 2, 3 and 4. Each digit will appear only once in each row, column, and 2 x 2 sub-grid (“box”).
Example:
