Reversible

8
23
1
24
1
1
1
5
1
1
1
2
2
1
1
1
2
1
1
1
2
1

2
1
22
2
1
1
5
1
3
1
1
2
1
1
1
1
1
2
1
1
2
2
17
1
1
1
1
2
1
1
1
1