
Punctuation
Could you please explain why some words in English are united with the dash symbol (-), for instance up-to-date, non-oil etc etc… Often I see the same words without dash in between, other times with it. Especially when the nouns are plurals, the letter S tends to disappear. i.e. 16-year-old. Is there a specific rule in place on how and when it is better to adopt the dash during writing?
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