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class Machine
  
  def start
      flip_switch(:on)
  end

   def stop
       flip_switch(:off)
  end
  
  private
  
  attr_writer :switch

   def flip_switch(desired_state)
       self.switch = desired_state
  end
end

You need self prepended to a private setter method. Unlike other private method where self is prohibited. This is to distinguish between setting a local variable and the instance method setter.
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