1: (0 6 8)

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

2: (1 20 7)

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

3: (8 11 15)

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

4: (10 16 12)

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