15 - fifteen, 50 - fifty, 13 - thirteen, 30 - thirty, 14 - fourteen, 40 - forty, 16 - sixteen, 60 - sixty, 17 - seventeen, 70 - seventy, 18 - eighteen, 80 - eighty, 19 - nineteen, 90 - ninety,

number names ('teen' vs 'ty')

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