20
20
15
21
21
20
21
16
21
21
21
21
21
20
16
16
20
17
18
21
21
21
21
21
21
12
21
21
16
20
21
18
21
21
12
21
18
21
21
21
21
21
16
21
15
21
21
21
19
16
21
21
16
21
21
21
21
12
12
21
21
21
15
15
21
20
21
21
21
21
21
21
21
21
21
21
17
21
20
20
21
21
21
21
18
21
21
21
21
12
21
18
20
21
21
21
21
21
9
21