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

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

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

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

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