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

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

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

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

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