"Now I get it!” (3)

I think it could be either:

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aha

(Other definitions for aha that I've seen before include "Exclamation of triumph or mockery, a palindrome" , "Palindromic exclamation of triumph or surprise" , "I'm surprised" , "Triumphant cry" , "Exclamation of triumph or surprise, a palindrome" .)

I've seen this clue in the Newsday, the Universal, the USA Today, the LA Times, the King Feature Syndicate and The New York Times.

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