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

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

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

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

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