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

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

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

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

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