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

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

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

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

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