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

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

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

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

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