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

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

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

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

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