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