"Ah, gotcha"

I think it could be either:

Which length description are you looking for?:

1,3

i see

I believe this is a double definition.

'ah' is the first definition.
(I've seen this in another clue)

'gotcha' is the second definition.
(I've seen this in another clue)

(Other definitions for i see that I've seen before include "Expression of dawning comprehension" , "So that's the way the cookie crumbles!" , "Got it now!" .)

I've seen this clue in The Wall Street Journal.

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