1: (1 5 15)

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

2: (0 7 3)

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

3: (1 5 15)

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

4: (4 10 6)

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