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