1: (1 15 20)

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

2: (1 5 8)

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

3: (4 11 6)

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

4: (0 9 2)

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