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

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

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

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

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