1: (2 7 15)

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

2: (6 16 7)

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

3: (1 9 3)

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

4: (5 11 8)

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