[[10, 15], [12, 15, 16], [], [17, 18], [], [10, 17], [14, 17], [], [15], [13, 16], [0, 5], [], [1], [9], [6], [0, 1, 8], [1, 9], [3, 5, 6], [3], []]
[[0, 2, -1, 4, -1, 2, 4, -1, 2, 4, 1, -1, 3, 5, 5, 1, 3, 3, 5, -1], [2, 0, -1, 6, -1, 4, 6, -1, 2, 2, 3, -1, 1, 3, 7, 1, 1, 5, 7, -1], [-1, -1, 0, -1, -1, -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, -1, 7, 9, 3, 5, 7, 1, 1, -1], [-1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1], [2, 4, -1, 2, -1, 0, 2, -1, 4, 6, 1, -1, 5, 7, 3, 3, 5, 1, 3, -1], [4, 6, -1, 2, -1, 2, 0, -1, 6, 8, 3, -1, 7, 9, 1, 5, 7, 1, 3, -1], [-1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1], [2, 2, -1, 6, -1, 4, 6, -1, 0, 4, 3, -1, 3, 5, 7, 1, 3, 5, 7, -1], [4, 2, -1, 8, -1, 6, 8, -1, 4, 0, 5, -1, 3, 1, 9, 3, 1, 7, 9, -1], [1, 3, -1, 3, -1, 1, 3, -1, 3, 5, 0, -1, 4, 6, 4, 2, 4, 2, 4, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1], [3, 1, -1, 7, -1, 5, 7, -1, 3, 3, 4, -1, 0, 4, 8, 2, 2, 6, 8, -1], [5, 3, -1, 9, -1, 7, 9, -1, 5, 1, 6, -1, 4, 0, 10, 4, 2, 8, 10, -1], [5, 7, -1, 3, -1, 3, 1, -1, 7, 9, 4, -1, 8, 10, 0, 6, 8, 2, 4, -1], [1, 1, -1, 5, -1, 3, 5, -1, 1, 3, 2, -1, 2, 4, 6, 0, 2, 4, 6, -1], [3, 1, -1, 7, -1, 5, 7, -1, 3, 1, 4, -1, 2, 2, 8, 2, 0, 6, 8, -1], [3, 5, -1, 1, -1, 1, 1, -1, 5, 7, 2, -1, 6, 8, 2, 4, 6, 0, 2, -1], [5, 7, -1, 1, -1, 3, 3, -1, 7, 9, 4, -1, 8, 10, 4, 6, 8, 2, 0, -1], [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0]]
7