(0 18 4)(1 6 3)(2 19 9)(5 11 8)(7 16 15)(10 14 12)(13 20 17)
ALLOWS (11/8)-SEQUENCE
1: (2 6 9)
(0 18 4)(1 6 19 9 3)(2)(5 11 8)(7 16 15)(10 14 12)(13 20 17)
2: (1 6 3)
(0 18 4)(1)(2)(3 19 9)(5 11 8)(6)(7 16 15)(10 14 12)(13 20 17)
3: (5 11 8)
(0 18 4)(1)(2)(3 19 9)(5)(6)(7 16 15)(8)(10 14 12)(11)(13 20 17)
4: (3 19 9)
(0 18 4)(1)(2)(3)(5)(6)(7 16 15)(8)(9)(10 14 12)(11)(13 20 17)(19)