How to break outer cycle in Ruby?

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Consider throw/catch. Normally the outside loop in the below code will run five times, but with throw you can change it to whatever you like, breaking it in the process. Consider this perfectly valid ruby code:

catch (:done) do
  5.times { |i|
    5.times { |j|
      puts "#{i} #{j}"
      throw :done if i + j > 5
    }
  }
end

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