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Language/Type: VB string

Write a function named IsAllVowels that returns whether a string consists entirely of vowels (a, e, i, o, or u, case-insensitively). For example, IsAllVowels("eiEIo") should return True while IsAllVowels("banana") should return False.

For this problem, you may assume that a working solution already exists to the problem IsVowel, and you may call it in your solution.

Function: Write a VB function as described, not a complete program.

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