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module Math
  def add(x, y)
    x + y
  end

  def sub(x, y)
    x - y
  end

  module More
    def mod(x, y)
      x % y
    end
  end

  class Calculator
    include Math
  end
end

module Power
  def get_horse_power
    puts "Power of the horse !"
  end
end

class MyCalculator < Math::Calculator
  include Power
  include Math::More
end

calc = MyCalculator.new
calc.get_horse_power

puts calc.add 1, 5
puts calc.sub 5, 4