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

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

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

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

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