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def letter_frequency(file)
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letters = 'a' .. 'z'
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File.read(file) .
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split(//) .
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group_by {|letter| letter.downcase} .
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select {|key, val| letters.include? key} .
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collect {|key, val| [key, val.length]}
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end
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letter_frequency(ARGV[0]).sort_by {|key, val| -val}.each {|pair| p pair}
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