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

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

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

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

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