1: (2 7 10)

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

2: (6 15 7)

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

3: (5 12 8)

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

4: (1 9 3)

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