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    Hyphens are used in the following situations:
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    1. To join two or more words serving as a single adjective before a noun.
    2. With compound numbers (e.g., twenty-one, fifty-five).
    3. To avoid confusion or awkward combinations of letters.
    4. With prefixes like ex-, self-, all-, and suffixes like -elect.
    5. Between a prefix and a capitalized word.
    6. With figures or letters.
    2 Sources
    Hyphen Use - Purdue OWL® - Purdue University
    Learn when to use a hyphen to join two or more words, avoid confusion, or divide words at the end of a line. See examples, rules, and exceptions for compound modifiers, numbers, pr…
    Purdue University
    https://owl.purdue.edu/owl/general_writing/punctuation/hyphen_use.html
    The Hyphen – What the Symbol Is and When to Use It (Examples)
    Learn what a hyphen is, how to use it in compound words, compound adjectives, and line breaks, and see examples of hyphenation. Find out the differences between hyphen, en dash, an…
    GrammarBrain
    https://grammarbrain.com/hyphen/
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    grammarbrain.com