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The phrase "a number of problematic" is not correct in English as it is incomplete and lacks a noun to clarify what is problematic.
You can use it when discussing multiple issues or challenges, but it needs to be followed by a noun for clarity.
Example: "There are a number of problematic aspects in the report that need to be addressed."
Alternatives: "several issues" or "multiple challenges".
Exact(18)
However, the putative 3D structure of the variant presented a number of problematic issues.
Since risk taking tends to generalize across domains, these results can potentially apply to a number of problematic risky behaviors.
Officials said that they were looking at 27 deals, and that while some appeared to have been "carefully constructed" to get around the letter of the law, they had identified a number of problematic cases and were focusing on companies still active in Iran.
The Open Babel nightly test suite ensures that this test passes for a number of problematic molecules.
After discarding a number of problematic questionnaires, we were able to use a total of 231 in our analysis.
It is actually quite easy to identify a number of problematic trends in the current schooling models prevalent around the globe.
Similar(42)
It also discusses a number of more problematic macro- and micro-scale features common to both pedogenic and non-pedogenic silcretes.
But critics of e-Verify, from the right as well as the left, consider Mr. Camarota's forecast to be an unlikely scenario that also overlooks a number of unexpected, problematic consequences.
This assumption has a number of rather problematic consequences.
Finally, the religious theodicy that we are considering also involves a number of very problematic moral claims.
Nevertheless, paired format OPIs introduce a number of other problematic factors that relate to construct definition, reliability, and fairness.
More suggestions(15)
a number of questionable
a number of intractable
a number of sensitive
a number of troublesome
a number of difficult
a number of complex
a number of issue
a number of difficulty
a number of troubled
a number of troubling
a number of thorny
a number of complicated
a number of challenging
a variety of problematic
a number of online
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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