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Discover LudwigThe phrase "known knowns" is grammatically correct and can be used in written English.
It is often used in discussions or writing about knowledge, truth, and understanding. Example: "In order to solve the problem, we must first identify the known knowns and then focus on the unknown unknowns."
Dictionary
known knowns
noun
Plural of known
Exact(58)
There are few known knowns, many known unknowns, and probably many unknown knowns, that is, the things we know that "ain't so".
First, the known knowns.
(c) "There are known knowns.
There are some known knowns.
It was a world of known knowns.
There are known knowns, there are things we know we know.
Reading from a 2004 memo, he says, "There are known knowns.
Rumsfeld, with his known knowns and unknown unknowns, would have approved.
It was:there are known knowns; there are things we know we know.
In other words: There are known knowns — there are things we know we know.
That is, perhaps, one of the few known knowns about Liz Cheney's brief, expensive journey west.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com