Incorrect
Explanation
Santa Claus is generally depicted as a portly, joyous, white-bearded man—sometimes with spectacles—wearing a red coat with white collar and cuffs, white-cuffed red trousers, and black leather belt and boots and who carries a bag full of gifts for children.
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7 is changed to 13. 11 is changed to 21. Then what does 16 become?