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

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

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

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

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