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

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

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

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

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