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Yes. Deletable duplicates are chiefly jpg quality downsamples, and identical images with differing md5s (usually the result of jpg crunching and exif stripping). Most other duplicates are parentable only.

potential_duplicate is programmatically determined by the IQDB analysis I mentioned, it would be preferable for manual tagging to use "duplicate" instead so it is clear it is not machine tagged.

If somebody would be so kind as to add a wiki page detailing the policies, procedures and tags involved it would be really helpful to users I think.