Corn Cockle - marks the 3rd place racer.

Hare's Ear - marks when the place determined initially by the odds goes from even to odd (double circle) and odd to even (circle).

Corn Cockle identified the 3rd place, so there are only two other odd number places to be predicted.
Those can be identified by Hare's Ear's predictions - x10 and x30.
Adding Nazuna's prediction, the first place will most probably go to x30.
Just in case, x10 can also be bet on.