Ad infinitum (2,3,2)

I think it could be either:

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2,3,2

on and on

'ad infinitum' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for on and on that I've seen before include "Incessantly" , "At tedious length" , "Unceasingly" , "Continuing or continually" , "Ever" .)

I've seen this clue in the LA Times.

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