1: (7 11 15)

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

2: (5 14 8)

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

3: (4 11 9)

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

4: (10 17 12)

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