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