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The phrase "a problem that required" is correct and usable in written English.
It can be used when discussing an issue or challenge that necessitated a specific action or solution.
Example: "The project faced a significant challenge, which was a problem that required immediate attention from the entire team."
Alternatives: "an issue that demanded" or "a challenge that necessitated".
Exact(17)
Afterward, the researchers presented both groups with a problem that required using Bubble Wrap in different ways.
Fraud was never a problem that required such restrictions, which were only intended to solve the Republican Party's larger problem of widespread rejection by minority groups.
He said that the mayor initially rebuffed him when he asked if Mr. Fabrizi had a problem that required help, but that Mr. Fabrizi came to him last spring or summer seeking help for substance abuse.
Before the Affordable Care Act, insurance companies could consider a person's health status when determining premiums, sometimes making coverage unaffordable or even unavailable if a person was already sick with a problem that required expensive treatment.
Before Obamacare, insurance companies could consider a person's health status when determining premiums, sometimes making coverage unaffordable or even unavailable if a person was sick with a problem that required expensive treatment.
Vince Muniga, a Chrysler spokesman, wrote in an e-mail that after the manufacturing changes were made, the automaker noticed the development of "a trend" of failures, indicating there was a problem that required a recall.
Similar(43)
But he added, "This is a problem that requires a long-term, sustainable solution".
For the moment, he is a problem that requires careful managing.
Getting around the two parts of Berlin is no longer a problem that requires careful planning.
Opponents argued that the plan would be an ineffective regional effort tackle a problem that requires a global solution.
Changing the incentives is therefore a problem that requires a coordinated effort by all stakeholders to alter reward structures.
More suggestions(16)
a threat that required
a book that required
a role that required
a budget that required
a pattern that required
a career that required
a test that required
a film that required
a rule that required
a designation that required
a cat that required
a result that required
a shot that required
a method that required
a study that required
a wound that required
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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