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

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

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

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

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