Reversible

9
3
1
8
1
4
2
1
3
1
1
1
4
2
1
1
4
1
1
2
1

3
1
2
1
1
8
3
2
1
1
1
1
1
3
1
4
2
1
1
1
4
1
2
1
1
2
1
1