15
15
15
15
15
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
16
19
14
19
21
15
14
9
11
21
15
18
21
21
19
14
11
11
16
8
8
12
17
18
21
21
16
17
21
21
15
12
16
20
21
15
18
16
21
19
20
16
15
15
11
16
14
21
21
21
21
21