I am fully confuse now.pic.twitter.com/7Eil6AY3zo
There are universal types, known knowns; there are things we know we know. We also know there are existential types, known unknowns; that is to say we know there are some things we do not know. But there are also bugs, unknown unknowns—the things we don't know we don't know.
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Are you Donald Rumsfeld?
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Any resemblance to persons, real or imaginary, is purely coincidental.
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There are also undecidable unknowns, the things we know are impossible, hence unknown.
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