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

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

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

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

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