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

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

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

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

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