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

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

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

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

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