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

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

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

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

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