[[0, 2, -1, 4, -1, 2, 4, -1, 2, 4, 1, 3, 5, 5, 1, 3, 3, 5], [2, 0, -1, 6, -1, 4, 6, -1, 2, 2, 3, 1, 3, 7, 1, 1, 5, 7], [-1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1], [4, 6, -1, 0, -1, 2, 2, -1, 6, 8, 3, 7, 9, 3, 5, 7, 1, 1], [-1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1], [2, 4, -1, 2, -1, 0, 2, -1, 4, 6, 1, 5, 7, 3, 3, 5, 1, 3], [4, 6, -1, 2, -1, 2, 0, -1, 6, 8, 3, 7, 9, 1, 5, 7, 1, 3], [-1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1], [2, 2, -1, 6, -1, 4, 6, -1, 0, 4, 3, 3, 5, 7, 1, 3, 5, 7], [4, 2, -1, 8, -1, 6, 8, -1, 4, 0, 5, 3, 1, 9, 3, 1, 7, 9], [1, 3, -1, 3, -1, 1, 3, -1, 3, 5, 0, 4, 6, 4, 2, 4, 2, 4], [3, 1, -1, 7, -1, 5, 7, -1, 3, 3, 4, 0, 4, 8, 2, 2, 6, 8], [5, 3, -1, 9, -1, 7, 9, -1, 5, 1, 6, 4, 0, 10, 4, 2, 8, 10], [5, 7, -1, 3, -1, 3, 1, -1, 7, 9, 4, 8, 10, 0, 6, 8, 2, 4], [1, 1, -1, 5, -1, 3, 5, -1, 1, 3, 2, 2, 4, 6, 0, 2, 4, 6], [3, 1, -1, 7, -1, 5, 7, -1, 3, 1, 4, 2, 2, 8, 2, 0, 6, 8], [3, 5, -1, 1, -1, 1, 1, -1, 5, 7, 2, 6, 8, 2, 4, 6, 0, 2], [5, 7, -1, 1, -1, 3, 3, -1, 7, 9, 4, 8, 10, 4, 6, 8, 2, 0]]
{0: 10, 2: 11, 3: 12, 4: 13, 5: 14, 6: 15, 7: 16, 8: 17}
7