1: (0 7 9)

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

2: (6 11 8)

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

3: (4 15 9)

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

4: (1 20 5)

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