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

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

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

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

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