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

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

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

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

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