1: (0 7 9)

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

2: (1 20 8)

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

3: (9 12 15)

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

4: (11 16 13)

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