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![Dynamic programming + Math: Count sorted vowel strings (LeetCode #1641) [3 solutions]](https://i.ytimg.com/vi/_SgsB1ZhcIQ/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLBM5v8D7WbH6IdauoG4sOTUuj0qjQ)
