(0 20 2)(1 6 4)(3 18 17 15 14 12 10)(5 9 7)(8 13 11)(16 21 19)
ALLOWS (11/8)-SEQUENCE
1: (1 6 8)

(0 20 2)(1 13 11 8 4)(3 18 17 15 14 12 10)(5 9 7)(6)(16 21 19)
2: (5 9 7)

(0 20 2)(1 13 11 8 4)(3 18 17 15 14 12 10)(5)(6)(7)(9)(16 21 19)
3: (4 11 8)

(0 20 2)(1 13 11)(3 18 17 15 14 12 10)(4)(5)(6)(7)(8)(9)(16 21 19)
4: (3 18 10)

(0 20 2)(1 13 11)(3)(4)(5)(6)(7)(8)(9)(10 17 15 14 12)(16 21 19)(18)