The document explains the use of hyphens in compound modifiers, highlighting the difference in hyphenation between phrases like 'well-known fact' and 'this fact is well known.' It also discusses the application of hyphens in phrases with more than two words, like 'three-week-old plants,' and introduces the concept of suspended hyphens. Additionally, it notes that adverbs ending in 'ly' are never hyphenated.
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