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

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

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

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

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