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

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

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

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

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