super.rb

class President
  attr_accessor :name, :age

  def initialize(name, age)
    @name, @age = name, age
  end

  def citizenship
    self.class.citizenship
  end
end

class UnitedStatesPresident < President
  def self.citizenship
    "The United States of America"
  end
end

class FrancePresident < President
  def self.citizenship
    "La France"
  end

  def age
    "#{super}, #{catchphrase}"
  end

  def name
    "#{super}, #{catchphrase}"
  end

  def citizenship
    "#{super}, #{catchphrase}"
  end

  def catchphrase
    "bien sur"
  end
end