16
16,17
17,18
16, 17,18
17
17,18
17,18
17
17,18
16
17,18
17, 18,19
16, 17,18
16, 17
16, 17
17
18
16,18
16,17
16, 17,18
17-18, 18-19
17-18, 19-20
16
16, 17,19
16, 17,18
16,17
16, 17, 18
16,17
16,17