Is 'pen' or 'pen' the correct spelling?

Some people insist that the word "chập bản" is the correct spelling. Others say that "chập bản" is correct.

In your opinion, is pen or penned correct?

“Chập bản” and “chập bản” are two words that are easily confused when used because their pronunciation is quite similar. So in your opinion, is “chập bản” or “chập bản” the correct spelling?

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Source: https://vtc.vn/chap-but-hay-chap-but-moi-dung-chinh-ta-ar786543.html