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Use "eighteens" in a sentence
"These winners will be chosen from a shortlist of up to ten entries in each category up to five entries for under fourteens and up to five entries for fourteens to eighteens."
"Snake oil clinics are okay, but only for the over-eighteens."
"Any bets on the percentage of over-eighteens who wind up being counseled, as opposed to the under-eighteens?"