1: (0 5 7)

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

2: (1 20 6)

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

3: (3 11 5)

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

4: (2 18 4)

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