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

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

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

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

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