1 0 2 [2, 8] 2 [2, 17] 2 2 3 [2, 8] 3 [2, 17] 3 2 4 [2, 8] 4 [4, 10] 4 [2, 17] 4 3 5 [5, 13] 5 [2, 8] 5 [5, 11] 5 [4, 10] 5 [2, 17] 5 5 6 [5, 13] 6 [2, 8] 6 [5, 11] 6 [6, 19] 6 [4, 10] 6 [2, 17] 6 6 7 [5, 13] 7 [2, 8] 7 [5, 11] 7 [6, 19] 7 [4, 10] 7 [2, 17] 7 6 8 [5, 13] 8 [2, 8] 8 [8, 17] 8 [5, 11] 8 [8, 10] 8 [6, 19] 8 [4, 10] 8 [2, 17] 8 8 9 [5, 13] 9 [8, 17] 9 [5, 11] 9 [8, 10] 9 [6, 19] 9 [4, 10] 9 [2, 17] 9 7 10 [5, 13] 10 [8, 17] 10 [5, 11] 10 [8, 10] 10 [6, 19] 10 [4, 10] 10 [2, 17] 10 7 11 [5, 13] 11 [8, 17] 11 [5, 11] 11 [6, 19] 11 [2, 17] 11 5 12 [5, 13] 12 [8, 17] 12 [6, 19] 12 [2, 17] 12 4 13 [5, 13] 13 [8, 17] 13 [6, 19] 13 [2, 17] 13 4 14 [8, 17] 14 [6, 19] 14 [2, 17] 14 3 15 [8, 17] 15 [6, 19] 15 [2, 17] 15 3 16 [16, 18] 16 [8, 17] 16 [6, 19] 16 [2, 17] 16 4 17 [16, 18] 17 [8, 17] 17 [6, 19] 17 [2, 17] 17 4 18 [16, 18] 18 [6, 19] 18 2 19 [6, 19] 19 1 8