Invitation letters (4)

I think it could be either:

rsvp

byob

(Other definitions for rsvp that I've seen before include "Kindly answer!" , "Brief request to acknowledge invitation" , "Invitation abbreviation" , "Reply to the invitation, please" , "Please reply to the French, in short" .)

I've seen this clue in The Wall Street Journal, the Newsday, The New York Times, the LA Times and The Star Tribune.

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