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Riddle of the Four Cards

There are four cards placed on a table:

4 cards

You’re told that each of the four cards has a numeral on one side and a letter of the alphabet on the reverse side. You’re then asked to prove that the following statement is either true or false:

If a card shows an even number on one side, then the other side is a vowel.

You are allowed to turn over two cards. Which cards should you turn over?

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