var validSolution = [[5, 3, 4, 6, 7, 8, 9, 1, 2],
                     [6, 7, 2, 1, 9, 5, 3, 4, 8],
                     [1, 9, 8, 3, 4, 2, 5, 6, 7],
                     [8, 5, 9, 7, 6, 1, 4, 2, 3],
                     [4, 2, 6, 8, 5, 3, 7, 9, 1],
                     [7, 1, 3, 9, 2, 4, 8, 5, 6],
                     [9, 6, 1, 5, 3, 7, 2, 8, 4],
                     [2, 8, 7, 4, 1, 9, 6, 3, 5],
                     [3, 4, 5, 2, 8, 6, 1, 7, 9]];

var invalidSolution = [[5, 3, 4, 6, 7, 8, 9, 1, 2],
                       [6, 7, 2, 1, 9, 0, 3, 4, 8],
                       [1, 0, 0, 3, 4, 2, 5, 6, 0],
                       [8, 5, 9, 7, 6, 1, 0, 2, 0],
                       [4, 2, 6, 8, 5, 3, 7, 9, 1],
                       [7, 1, 3, 9, 2, 4, 8, 5, 6],
                       [9, 0, 1, 5, 3, 7, 2, 1, 4],
                       [2, 8, 7, 4, 1, 9, 6, 3, 5],
                       [3, 0, 0, 4, 8, 1, 1, 7, 9]];

validateSolution(validSolution); // returns true
validateSolution(invalidSolution); // returns false