1: (0 2 15)

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

2: (1 18 4)

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

3: (2 15 17)

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

4: (15 17 19)

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