1. visit the useradmin portal, http://localhost:4502/useradmin
2. Create new user group, "cannot_delete_pages".
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3. add the group "authors" into this group.
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4. edit the user group, cannot_delete_pages, to "disallow page deletion on /content
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5. press save.
6. find the user group, and validate changes
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7. assign the group to a user, and test!