1: (0 2 7)

(0)(1 20 3)(2 9 7 19 8 6 4)(5 12 10)(11 21 18 16 13)(14 17 15)

2: (1 20 3)

(0)(1)(2 9 7 19 8 6 4)(3)(5 12 10)(11 21 18 16 13)(14 17 15)(20)

3: (2 9 4)

(0)(1)(2)(3)(4 7 19 8 6)(5 12 10)(9)(11 21 18 16 13)(14 17 15)(20)

4: (6 19 8)

(0)(1)(2)(3)(4 7 19)(5 12 10)(6)(8)(9)(11 21 18 16 13)(14 17 15)(20)