1: (0 5 17)

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

2: (1 20 8)

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

3: (7 17 9)

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

4: (4 16 6)

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