L/O in a racing program?

I was just looking up the official entries for the Arkansas Derby on Oaklawn’s site. Everybody in the field gets an L, which is clearly Lasix. Two (Improbable and One Flew South) have L/B, so I think they also get blinkers. Okay, makes sense.

But only Galilean is listed as L/O. What is O? I can’t mentally tag that to any piece of equipment or med, and a quick Google search on program language didn’t identify an O, either. Whatever it is, that only seems to show up one other time on the whole day’s entries, so not too common a thing. What is the O for?

O is blinkers off.

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Ah, wasn’t thinking about deletions. Thanks!