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

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

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

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

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