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Discover LudwigSuggestions(5)
"are only valid" is correct and usable in written English.
You can use it to indicate that something is acceptable within a certain set of rules or conditions. Example: "Those discount codes are only valid when used within the sale period."
Exact(59)
Ideas are only valid if they fit into media schedules.
Test scores are only valid for five years.
However, these results are only valid for the analyzed cases.
However, available methods are only valid for ideal mixtures.
"Those protections are only valid as long as there's a law protecting people.
GRE scores are only valid for five years after the test date.
Test scores are only valid for five years, calculated using your application round deadline.
These figures are only valid for urine samples with inactive sediments.
Please note that GRE scores are only valid for five years.
Results are only valid for courses offered during the Fall 2019 semester.
No. Placement test results are only valid for the semester in which the test is taken.
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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