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