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know all the answers▼[UK: nəʊ ɔːl ðə ˈɑːn.səz] [US: ˈnoʊ ɔːl ðə ˈæn.sərz]
know one's stuff▼[UK: nəʊ wʌnz stʌf] [US: ˈnoʊ wʌnz ˈstəf]
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