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I added one slug and page with the same name and they worked fine, but when creating a second WP forced me to rename the page (being created after the category) with an additional "-2" how to clear the additional "-2".

if i delete the category and create new category in same name then it display as "-3"

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You cannot have duplicate slugs or taxonomies, to remove the number you will need to delete them.

There is a database hack to have duplicate terms but it's probably not a great idea, Removing the number in a category slug

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+1 Maybe you want to write "but it's probably not a great idea" bold :) – kaiser Mar 10 '12 at 11:42
I don't know what hack you're talking about but I have a page and a post with the same slug. It can cause problems, but there is no warning ahead of time. – AlxVallejo Apr 3 '12 at 16:08
This was fixed in a more recent version of WordPress, maybe yours is outdated or it's possible you made those posts when WordPress allowed it. Also some plugins like WPML allow this. – Wyck Apr 3 '12 at 18:34

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