20
12
15
21
20
15
21
21
21
16
20
21
20
21
16
21
21
21
21
21
21
19
21
21
21
21
21
17
21
21
21
21
21
20
21
21
21
21
18
16
21
21
21
17
21
21
21
20
21
21
16
16
15
20
21
8
12
15
21
21
20
16
15
15
20
17
21
21
15
21
15
19
16
21
21
16
21
21
21
21
21
21
20
21
21
21
15
17
15
21
16
21
21
21
21
21
15
12
16
21