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

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

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

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

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