.
Once
2 times
3 times
More than 3 times
16
12
10
8
18
28
20
24
16
17
26
30
24
16
21
14
16
13
9
7
8
9
10
11
11
13
9
15
20
24
28
32
29
27
23
30
16
8
14
12
4
7
9
18
29
38
40
35
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