1: (7 10 15)

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

2: (4 10 8)

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

3: (9 17 11)

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

4: (14 18 16)

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