21
21
20
21
20
21
21
21
21
17
21
21
21
21
21
21
20
21
21
21
21
21
21
21
21
21
21
21
21
21
17
21
20
21
21
21
21
20
17
21
21
21
21
21
20
21
21
20
21
20
21
17
21
21
21
21
20
21
21
21
21
21
21
21
21
20
19
21
21
21
21
21
21
21
20
21
21
20
21
21
21
21
21
21
21
21
21
21
21
21
21
21
17
21
21
20
21
21
21
21
21
21
21
21
21
21
21
16
21
21
21
21
21
21
21
21
21
21
21
20
21
21
21
21
20
21
21
21
20
20
20
21
21
21
21
20
21
17
13
20
18
17
19
19
18
20
21
21
21
21
20
20
20
20
20
21
21
21
21
21
21
21
21
21
17
21
21
21
21
21
21
21
21
21
21
19
21
21
21
20
21
21
20
20
21
21
21
21
21
19
21
21
21
21
21
21
21
21
19