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