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