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idea, a compound adjective.

A compound modifier that is spaced rather than hyphenated is referred to as an open compound.

When a numeral and a noun are used in a compound modifier that precedes a noun, the noun in the modifier takes the singular form. For example, the 2021 Belmont Stakes was a "12-furlong race" and an "eight-horse race", not a "12-furlongs race" or an "eight-horses race".

Exceptions

Major style guides advise consulting a dictionary to determine whether

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