When should you use a hyphen in a suffix?

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When should you use a hyphen in a suffix?

A hyphen should be used in a suffix when it is attached to a proper noun or when it helps to clarify the meaning of the word. Additionally, a hyphen should be used when the suffix is attached to a compound word or when it is used to avoid confusion or misinterpretation. For example, "pre-World War II" or "re-examine."