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

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

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

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

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