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(a) Hyphenate two nouns representing different but equally important functions, i.e. where the hyphen denotes the relationship "both A and B":
(b) Hyphenate nouns normally written as two words, when they have a modifier and when ambiguity would otherwise result:
Similarly, compound nouns normally written as a single word must be separated into their component parts and then joined to their modifier by a hyphen when the modifier applies only to the first component:
(c) Hyphenate compound units of measurement made by combining single units that stand in a mathematical relationship to each other:
(d) Hyphenate compounds that include a finite verb:
(e) Hyphenate nouns of family relationship formed with great and in-law:
but
(a) Hyphenate noun-plus-adjective compounds (in that order), whether used attributively or predicatively:
(b) Hyphenate noun-plus-participle compounds regardless of the position:
There are a number of them, including handmade and handwritten.
(c) Do not hyphenate noun-plus-gerund compounds (present participle used as a noun); they may be written as one or as separate words:
See 2.04 Compound adjectives; adjectives and participles in compounds(e) for such compounds used adjectivally.
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