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Discover Ludwig'are permanent' is correct and usable in written English.
You can use this phrase to describe something that is not subject to change, such as a physical trait. For example, "The blue markings on his face are permanent."
Dictionary
are permanent
noun
A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm.
synonyms
Exact(60)
"But there are permanent friends".
Most are permanent residents.
Which are permanent?
Four are permanent.
Tattoos are permanent, you know".
Furthermore, these effects are permanent.
Not all the jobs are permanent ones.
"They are permanent scars," he added.
"Your after-graduation earnings are permanent".
The corporate taxes are permanent.
How permanent are permanent photographs?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com