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There are unknown unknowns

phrase by Donald Rumsfeld

en-GB/ˈðɛə ɑːɹ ʌnˈnəʊn ʌnˈnəʊnz/
en-US/ˌðeɪɹ ˈɑɹ ənˈnoʊn əˈnoʊnz/

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Redewendung (idiomatic expression)phrase