1: (0 3 12)

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

2: (1 20 7)

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

3: (2 18 4)

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

4: (3 14 5)

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