oop2quickchallenge.rb

require 'pry'

class Car

	class Make < Car

	  @@makes = []

	  def self.add_make(make)
	    @@makes << make
	  end

	  def self.valid_makes
	    @@makes
	  end
	  
	  class Model < Make
	  	@@models = []

		  def self.add_model(model)
		    @@models << model
		  end

		  def self.valid_models
		    @@models
		  end
		end
	end
end