Remove permissions for deleting a page but keeping permission for modifying contents of the page

Hi,

I´m trying to revoke permisssions to certain users for deleting pages; so I am using the ACL deny for jcr:removeChildNodes and jcr:removeNode; however if I do this then the user is of permission for modifying the contents of a page (cut, paste, etc) but I want them to be able to modify pages.

Example::

/content/project/branch-of-pages/page1

/content/project/branch-of-pages/page2

I want the user to keep on being able to modify contents for page1 and page2, but I don´t want them to be able to remove any page under /content/project/branch-of-pages; is that possible?

I have been experimenting with pruning permissions at a top level (/content/project) and then in the leaf node adding permissions for jcr:removNode and jcr:removeChildNodes if the node has rep:glob *jcr:content*, but with no success.

Do you know what would be the combination of permissions I would need to do what I want?