21
21
21
21
21
21
21
21
21
20
21
21
20
21
16
21
21
20
21
19
21
19
21
21
21
21
21
21
21
21
17
20
15
16
21
21
21
21
21
17
21
21
21
20
21
20
21
21
21
21
21
21
16
21
21
21
21
21
21
16
21
21
19
21
21
21
21
21
21
21
21
21
21
21
21
21
16
16
21
20
20
21
21
21
21
21
20
20
21
21
21
21
21
21
21
21
21
21
21
21
21
21
16
21
21
21
21
21
21
21
21
21
21
21
16
20
21
21
21
21
21
17
21
21
21
21
21
16
21
21
16
15
20
21
21
21
16
21
16
21
21
21
21
21
16
21
21
21
21
19
21
21
20
21
21
21
21
21
20
20
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
21