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if else statement
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![Leetcode 678. Valid Parenthesis String [Java]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F1TDmgo1Sa2o%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLBzHD9fqmU9rDe6MYyOOv4fG7rfuw&w=256&q=75)
