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Philosophical zombies are creatures that are exactly like us, down to the atomic level, except they aren't conscious.
Complete philosophical zombies go further. They too are exactly like us, down to the atomic level, and aren't conscious. But they are also purple spheres (except we see them as if they weren't), they want to maximize paperclips (although they act and think as if they didn't), and they are very intelligent (except they act and think as if they weren't).
I'm just saying this because I find it funny ^^. I think consciousness is harder (for us) to reduce than shapes, preferences, and intelligence.