composition.rb

require 'pry'
class Car
	attr_reader :model, :valve
	def initialize(model, valve)
		@model = model
		@engine = Engine.new(valve) 
	end
	def run 
		puts "wowowowo"
	end
end

class Engine 
	def initialize(valve)
		@valve = valve
	end
end


car = Car.new("9-3 convertible", 4)

binding.pry