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

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

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

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

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