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

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

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

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

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