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used where grammar dictates a certain sentence member, e.g., to provide a "support" on which to hang a modifier. The word most commonly considered as a prop-word in English is one (with the plural form ones). The prop-word one takes the place of a countable noun in a noun phrase (or determiner phrase), normally in a context where it is clear which noun it is replacing. For example, in a context in which hats are being talked about, the red one means "the red hat", and the ones we bought means "the hats we bought". The prop-word thus functions

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