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func letter_frequency(File file) {
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file.read.chars.grep{.match(/[[:alpha:]]/)} \
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.group_by {|letter| letter.downcase} \
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.map_val {|_, val| val.len} \
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.sort_by {|_, val| -val}
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}
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var top = letter_frequency(File(__FILE__))
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top.each{|pair| say "#{pair[0]}: #{pair[1]}"}
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