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

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

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

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

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