How many meaningful four-letter words can be formed using the letters of the word “CLOUD”, using each letter only once?

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1. We need four-letter English words from letters C, L, O, U, D, using each letter once.

2. Try valid words: **COLD**, **LOUD**, **CLOD**, **LUDO**.

3. Count them: there are $4$ such words.

FINAL_ANSWER: <d>

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