12
15
21
11
8
8
9
9
12
21
8
13
17
11
21
15
21
17
8
15
21
12
15
21
15
21
21
21
21
21
21
17
15
21
21
15
16
17
16
21
21
21
15
21
21
15
21
20
15
16
21
16
21
21
21
16
21
16
16
16
21
21
21
20
18
20
18
15
12
21
21
15
16
21
21
21
21
21
21
21
21
21
21
21
21
15
21
16
21
21
17
21
21
21
21
21
12
21
21
21