1: (5 10 15)

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

2: (4 10 8)

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

3: (9 16 11)

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

4: (1 15 8)

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