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