1: (7 11 15)

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

2: (3 11 9)

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

3: (5 18 8)

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

4: (1 6 4)

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