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

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

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

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

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