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U.S. Secretary of Defense Donald Rumsfeld issues his famous statement about "unknown unknowns" at a DoD News Briefing.
"As we know, There are known knowns. There are things we know we know. We also know There are known unknowns. That is to say We know there are some things We do not know. But there are also unknown unknowns, The ones we don't know We don't know." |
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