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If you use public as a noun, it's κοινό (in the sense of people in general). If you use public as an adjective it's δημόσιος (in the sense of accessible to all). More for nouns is περισσότερο, whereas for adjectives the comparative is πιο. Πιο κοινό would mean that κοινό is an adjective, which would mean "more common".