1: (0 6 12)

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

2: (1 20 8)

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

3: (5 10 7)

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

4: (3 6 17)

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