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The phrase "are not unknown" is correct and usable in written English.
It can be used to indicate that something is familiar or recognized, often in a context where one is discussing information or phenomena that are already known to some extent.
Example: "The challenges we face in this project are not unknown to our team, as we have encountered similar issues in the past."
Alternatives: "are well-known" or "are familiar."
Exact(60)
But they are not unknown.
Even deaths are not unknown.
Such cases are not unknown.
These works are not unknown.
Hockey riots are not unknown in Canada.
POLITICAL fairytales are not unknown in Peru.
But such cases are not unknown.
Prison breaks are not unknown in Belgium.
Killings of repo men are not unknown.
Sometimes cars break down, and speeding tickets are not unknown.
Similar forms of oppression are not unknown in developed nations.
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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