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

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

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

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

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