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per – prep. for each
challenge – n. a call to take part in a competition; a test
dip - n. a drop or decrease
hospitality – n. the warm welcome and friendly treatment of visitors and strangers
management – n. the process of dealing with or controlling things
substitute – n. replacement; something to take the place of something else
harassment – n. aggressive pressure
discount – n. an amount taken off the usual price; a price reduction
setback – n. a problem that makes progress more difficult or success less likely
