An important point of Stubbie's diagram is that, once the two 3-wire cables get to switch box 2, the separate neutrals serve only the respective lights, i.e. are not tied together at switch box 2.
(One morning on WRKO Radio) The tub's not clean! Let's remodel the bathroom.
(One afternoon on WRKO Radio) It's time for an oil change. I'm going to trade in the car for next year's model.