1: (2 7 12)

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

2: (6 15 7)

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

3: (0 9 3)

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

4: (5 11 8)

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