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A site no longer appearing in a directory does not necessarily mean it has been removed; it may have been forwarded to a more appropriate category or temporarily "unreviewed" because it was returning error messages. Also, the processes behind the adding of a site to the directory's database, updating the public pages to display that listing, and appearing in the dmoz.org search engine are independent; one may be ahead of or behind the others. I will note, however, that ODP looks askance at multiple listings or deeplinks for the vast majority of businesses (e.g. non-Fortune 1000 companies).