XV Sudoku
(Published on SudokuCup.com)
Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and 3x3 boxes. All adjacent cells with two digits summing to 5 are marked by V, while those summing to 10 are marked by X. The cells edges which do not contain a V or an X cannot have digits summing to 5 or 10.
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