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

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

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

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

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