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

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

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

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

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