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

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

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

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

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