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Discover Ludwig"are not fixed" is a correct and common phrase in written English.
It is used when referring to something that can be changed or is not constant. For example, "The prices of these products are not fixed and can fluctuate depending on market conditions."
Exact(60)
Those rosters are not fixed, however.
Clearly, then, their shapes are not fixed.
Our happiness levels are not fixed.
These are not fixed institutional forces but fungible, political ones.
Species are not fixed entities created at one time.
However, ECM cultured cells are not fixed in these states.
Human memories are not fixed, they are reconstructed.
Results demonstrate that attitudes towards wildlife are not fixed.
If not, well, the rules are not fixed.
Even so, the class lines in American sports are not fixed.
Today, most people's identities and beliefs are not fixed but highly fungible.
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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