1: (0 3 16)

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

2: (1 20 7)

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

3: (4 16 12)

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

4: (2 18 5)

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