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

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

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

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

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