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# p ARGF.read.split("\n\n").map {|g| g.gsub("\n", "").chars.uniq.count }.sum
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p ARGF.read.split("\n\n").map {|group|
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people = group.split("\n").map(&:chars)
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first = people.shift
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first.count {|answer| people.all? {|answers| answers.include?(answer) }}
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}.sum
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