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From a printworthy page title: This is a redirect from a title that would be helpful in a printed or CD/DVD version of Wikipedia. See Wikipedia:Printability and Version 1.0 Editorial Team for more information.

From a subtopic: This is a redirect from a subtopic of the target article or section.
- If the redirected subtopic could potentially have its own article in the future, then also tag the redirect with {{R with possibilities}} and {{R printworthy}}.

When appropriate, protection levels are automatically sensed, described and categorized.

Perfectly normal Hausdorff space