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

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

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

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

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