How do you turn an odd number into even by removing one letter?怎样回答这句话

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How do you turn an odd number into even by removing one letter?
怎样回答这句话

seven,去掉S,就变成even.这句话中的 even 不理解成偶数,而是看成是一个字,有点脑筋急转弯的味道.