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

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

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

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

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