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