Exact(5)
This time, I don't know how the problem can be solved.
Several governmental officials said the vast blackout today originated in the United States but concluded tonight that they did not know how the problem had erupted, or where.
Cloth merchant Chandrashekhar, who paid for the board out of his own pocket as a sign of respect, said he didn't know how the problem occurred, but pointed to a mistake at the designer's end.
I don't know how the problem started exactly, but the other Sarah Perez can't seem to remember her email address.
No one seems to know how the problem occurred, except that it happened during routine maintenance work.
Similar(55)
For example, if you think you know how the scheduling problems for overtime can be worked out, you may want to write up your ideas in a memo, and send it to your superior(s).
She does not know how the age-old problem of prostitution can be solved, but she sees some of the issues that contribute to it.
"We don't know how the channels work, or where the problems will pop up next".
Knowing how the individual problem characteristics are related to each other is important because it would provide insight in the causal mechanisms that make a good problem.
"This is still not over – we don't know how big the problem really is … The fear is that it could get worse," he said.
The actual number of incidents could be far higher, says the document, referring to significant under-reporting and poor record-keeping, which means that "the UN does not know how serious the problem of SEA [sexual exploitation and abuse] is".
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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