1: (0 3 15)

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

2: (1 20 7)

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

3: (2 18 4)

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

4: (3 16 5)

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