How to use the same URL for different pages, but add {id} for the second page

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I have a page which has the url (/articles), I need to make another one that will lead to a single post but it should have the url (articles/{id}) example : (articles/20).

when i try to make another page with the url (/articles) in word press it says that the url already exists which I get why.

I just need a way to get around this.

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