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Ruby code posted
created at 30 May 19:37

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class Bicycle
  # This class is empty except for initialize.
  # Code has been moved to RoadBike.
  def initialize(**opts)
  end
end

class RoadBike < Bicycle
  # Now a subclass of Bicycle.
  # Contains all code from the old Bicycle class.
end

class MountainBike < Bicycle
  # Still a subclass of Bicycle.
  # Code has not changed.
end
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