1: (0 3 15)

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

2: (2 18 4)

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

3: (1 20 5)

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

4: (3 16 6)

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