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

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

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

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

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