Logic Level 2

There are five two-sided cards lying on a table. Each card contains a letter on one side and a positive integer on the other. Two cards show the letters $$A$$ and $$B$$. The other three cards show the numbers $$2, 4, 6$$. The back sides of these cards are not visible.

Alice says, "If a card has an odd number on one side, then the other side must have a vowel."

Bob proved Alice wrong by turning over one card. Which card is it?

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