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