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Tags give an error 404 searching for 2 tags that are not inappropriate

When I go to nova skin looking for skins, I figure out that 2 tags “highway” and “minegerald” would give an error 404 when I search for skins in this tags, can anyone tell me why these tags are removed?

I know they remove inappropriate tags in novaskin but why did they remove the tags “highway” and “minegerald” in this site?