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

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

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

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

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