What Is a Hyphen?
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A hyphen (-) is a punctuation mark that’s used to join words or parts of words. It’s not interchangeable (взаимозаменяемый) with other types of dashes (тире).
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Use a hyphen in a compound modifier when the modifier comes before the word it’s modifying.
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If you’re not sure whether a compound word has a hyphen or not, check your preferred (предпочитаемый) dictionary.