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

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

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

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

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