1: (0 2 9)

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

2: (1 10 8)

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

3: (4 9 20)

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

4: (3 11 5)

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