1: (7 11 15)

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

2: (6 13 8)

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

3: (4 11 9)

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

4: (10 16 12)

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