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The phrase "a number of certain" is not correct and does not convey a clear meaning in written English.
It is unclear and redundant, as "a number of" implies plurality, while "certain" suggests specificity, which can lead to confusion.
Example: "A number of certain factors contribute to the outcome of the experiment."
Alternatives: "several specific" or "a few particular".
Exact(2)
Asked why the government believed it needed to keep journalists out of detention camps, Cormann said it was one of a number of "certain operational disciplines that have been central to our success in keeping our borders secure".
Further, we consider a number of certain consequences of the main results.
Similar(58)
The plaintiffs argue that, for a number of reasons, certain parts of that proxy statement are either incomplete or misleading.
Within subgroup I, a limited number of certain serotypes are recognized as having a higher propensity for causing extraintestinal disease on the basis of distinct virulence-associated characteristics.
3. Unlimited Brainiacs – The U.S. is inviting an unlimited number of certain physicians, professors, researchers and other people of "extraordinary ability".
Similar to mice, worms with mutated or deleted PIG-1 are viable and relatively healthy albeit with an altered number of certain neurons (Cordes et al., 2006).
She listed the hidden dangers of a number of ingredients in certain external analgesic medications.
They're only allowed to visit a highly limited number of certain areas.
A number of exchanges cater to certain types of investors.
This results from an increase in the number of certain membrane bound organelles [21], [24].
"We feel we have found a number of elements to charge a certain number of athletes," Oswald said.
More suggestions(16)
a number of safe
a number of particular
a number of instances
a number of indications
a number of assurances
a number of critics
a number of given
a number of examples
a number of specified
a number of governing
a number of selected
a number of defenders
a number of little
a number of true
a number of individual
a number of discrete
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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