1: (0 3 15)

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

2: (1 20 6)

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

3: (3 17 8)

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

4: (5 11 7)

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