[[0, 0], [1, 0], [2, 0], [3, 0], [0, 1], [2, 1], [4, 1], [5, 1], [8, 1], [9, 1], [4, 2], [6, 2], [9, 2], [3, 3], [5, 3], [6, 3], [7, 3], [1, 4], [4, 4], [6, 4], [7, 4], [1, 5], [2, 5], [3, 5], [5, 5], [0, 6], [4, 6], [6, 6], [0, 7], [2, 7], [7, 7], [9, 7], [1, 8], [3, 8], [4, 8], [5, 8], [8, 8], [1, 9], [4, 9], [7, 9], [8, 9]]
16