1: (0 6 11)

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

2: (1 20 7)

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

3: (6 14 8)

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

4: (9 16 12)

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