Request after being barraged with questions (3,2,1,4)

I think it could be either:

Which length description are you looking for?:

3,2,1,4

one at a time

(Other definitions for one at a time that I've seen before include "A-team, I note, travelling separately" , "Singly" , "Individually" .)

I've seen this clue in The New York Times.

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