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Hello - We have a site with over 1,000 tags. We added too many and would like a fresh start as they are creating a lot of duplicate pages on the site. What is the best way to go about deleting all of these tags without being penalized by Google? Is there a way to tell Google direclty to stop crawling them? We would prefer to not have that many pages just sit as 404 errors on the site. Thank you.