16, 17
16, 17, 18
16.5-14.5
16, 17
19
15.7,16.5
16
17
17
16, 18
17, 18,20
17
17
15, 16
18
16
18
17,18
17,18
17,18
16, 17,18
16
18
16, 17, 18, 19,20