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p ARGF.read.lines.each.with_object(Hash.new(0)) {|line, fabric|
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line =~ /(\d+),(\d+): (\d+)x(\d+)$/
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x = $1.to_i
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y = $2.to_i
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width = $3.to_i
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height = $4.to_i
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width.times {|dx|
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height.times {|dy|
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fabric[[y + dy, x + dx]] += 1
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}
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}
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}.count {|_,v| v > 1 }
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