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{"ops":[{"insert":"In a 2x2 Sudoku puzzle, there are 4 connected 2x2 grids and the objective is to fill the grid with\nnumbers from the set V = {1, 2, 3, 4}, such that each number appears exactly once in the same grid,\nexactly once in any row, and exactly once in any column. Below is a diagram depicting an empty\n2x2 Sudoku and a possible solution state.\n\nWrite a program that takes an empty 2x2 grid as input and fills it to reach a valid solution state using\nbacktracking.\n"}]}
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