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