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The part of the sentence "a challenging problem to" is correct and usable in written English
You can use this phrase when you are referring to something difficult that needs to be solved or addressed. For example: "This is a challenging problem to solve, but I'm confident that we can find a solution."
Exact(45)
It is a challenging problem to design a blind color image watermarking scheme.
As yet it remains a challenging problem to work out, starting from the design of a system until its implementation.
However, it is still a challenging problem to design a good proposal distribution to generate high-quality particles.
It is a challenging problem to try to move science publishing from its 17th century home to one in the 21st century.
Although there has been a few research done on micromanagement skills, it is still a challenging problem to design human-like high-level control skills.
Since the color image watermark has more bit information, it is a challenging problem to design a robust and blind color watermarking scheme for copyright protection.
Similar(15)
It's a very packed space because determining fit and style preference remotely is a surprisingly challenging problem to crack.
The young active patient with advanced glenohumeral degenerative joint disease represents an extremely challenging problem to treat.
Have a really technical challenging problem to solve.
By sending the messages we did with Voyager, we actually delivered a much more challenging problem to any aliens "lucky" enough to come upon it.
The 2D-to-3D inference is intrinsically a challenging problem due to the loss of 3D information in projection to 2D frames.
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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