ruby airport_employee.rb

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module CheckID
  def check_id
    "Please let me see your identification."
  end
end

class AirportEmployee
end

class GovernmentAuthority < AirportEmployee
  include CheckID
end

class AirlineEmployee < AirportEmployee
end

class Management < AirlineEmployee
  include CheckID
end

class NonManagement < AirlineEmployee
end

class GroundCrew < NonManagement
end

class CounterAttendant < NonManagement
  include CheckID
end

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