3 6 9 12 15 18 21 24 27 30 
3 6 9 10 12 15 18 19 21 24 25 27 30 
3 6 9 10 10 12 15 18 19 19 21 24 25 25 27 30 
lower on 13 15
lower on 25 25
upper on 25 27
equal range on 19
first 19
second 21
3 6 9 10 10 12 15 18 19 19 21 24 25 25 27 30 
3 6 9 12 15 18 21 24 25 25 27 30