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