1: (2 8 15)

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

2: (0 10 3)

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

3: (7 12 9)

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

4: (1 15 6)

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