"__ you sure?" (3)

There are a few possibilities for this:

Which length description are you looking for?:

4 6

are

(Other definitions for are that I've seen before include "Exist; square measure" , "Is, in the plural" , "is for more than one" , "live" , "(We/you/they) exist" .)

I've seen this clue in the USA Today, the LA Times and the Universal.

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