Question: Another state has this rule for its license plates: A plate that has a vowel as its first letter must also have a vowel as

Another state has this rule for its license plates: A plate

Another state has this rule for its license plates: A plate that has a vowel as its first letter must also have a vowel as its second letter. (E.g., CD, OE,NO are allowed, but ON is not.) How many possible two-letter prefixes are there? (Only A, E, I, O, and U are considered vowels.)

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