Reversible

23
3
1
2
1
2
1
3
1
4
11
2
1
2
2
1
1
1
3
2
7
1
12
1

22
5
1
1
3
1
1
4
1
11
1
2
1
1
1
1
1
2
1
1
2
1
3
7
1
6
1
2
1
2