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

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

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

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

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