Crossword Genius

Zip (4)

Ross

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4

4*

(Other definitions for code that I've seen before include "regulations" , "Method of secret communication" , "Established standards" , "System of words arrangement for secrecy" , "System of ethics - cipher" .)

I've seen this clue in the Newsday, The Wall Street Journal, the Sydney Morning Herald, the Penny Press, the LA Times, The Star Tribune and The New York Times.
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