Yoast SEO plugin "this focus keyword once before"
In Yoast SEO plugin, there is an error repeating (You've used this focus keyword once before. It’s probably a good idea to read about why you should not use your focus keyword more than once).
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This is a big problem, my site has hundreds of articles, for example: Donald Trump, 50 articles.
So, Yoast SEO plugin will say that the word is repeated,
SEMrush 
What's the solution, what's the matter?

We don't use or recommend Yoast plugin because they got your page over optimized.
what do you mean? Or do you mean exactly?

what do you mean? Or do you mean exactly?
We prefer 'All in one SEO Pack' instead of Yoast.

Sometimes it's okay to ingore Yoast suggestions :)
Though I wouldn't recommend writing a lot on similar keywords. Had a lot of 'fun' recently fixing canibalization issues on my website.

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