User:Rocket000/PD-chem
It's kinda hard to put into words my criteria, so here's some visual examples. Most of these I think are ineligible anyway (and so do the uploaders/authors), but I'm not having my bot touch them. I pick them at random, but some of them are really borderline (not as far as PD status, but what I'm choosing for my bot.)
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Yes
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No
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Yes
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No
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Yes
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No
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Yes
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No
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Yes
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No
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No
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Yes
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No (although the uploader tagged as such)
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Yes
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Probably, but not right now
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Not right now