(0 12 8 6 4)(1 19 17 15 2)(3 14 5)(7 11 9)(10 16 13)(18 21 20)
ALLOWS (11/8)-SEQUENCE
1: (0 2 4)

(0)(1 19 17 15 2 12 8 6 4)(3 14 5)(7 11 9)(10 16 13)(18 21 20)
2: (2 12 15)

(0)(1 19 17 15 8 6 4)(2)(3 14 5)(7 11 9)(10 16 13)(12)(18 21 20)
3: (10 16 13)

(0)(1 19 17 15 8 6 4)(2)(3 14 5)(7 11 9)(10)(12)(13)(16)(18 21 20)
4: (8 17 15)

(0)(1 19 17 6 4)(2)(3 14 5)(7 11 9)(8)(10)(12)(13)(15)(16)(18 21 20)