Number_of_E-mails
1
2
1
4
1
5
2
1
1
1
2
3
2
2
3
4
1
2
2
1
1
1
4
1
1
2
3
1
2
1
1
21
1
1
7
1
1
1
1
1
1
1
3
1
2
1
1
2
1
1
1
1
1
2
5
3
1
1
1
4
2
1
2
2
5
2
1
2
1
1
8
2
1
3
1
2
1
3
3
1
1
1
1
2
3
1
3
2
1
3
1
3
1
1
2
1
1
1
1
2
8
2
1
2
1
1
2
2
1
2
5
6
2
1
1
1
1
1
2
1
4
1
2
1
5
3
2
1
2
2
1
1
2
2
1
1
6
1
2
1
2
3
4
3
4
2
1
1
3
1
2
2
1
1
1