1: (3 8 12)

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

2: (1 10 4)

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

3: (9 13 11)

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

4: (3 16 6)

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