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