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

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

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

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

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