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A diode only allows electricity to flow one way through it. How does this help, you may ask? Well, if you remember that relays can either go forward (+ voltage applied to + terminal) or backwards (- voltage to + terminal, + voltage to - terminal), you'll see some very interesting possibilities. Check out the diagram on the bottom of Page 11 of the Robot Rules. It's got the wiring info necessary to drive two solenoid valves with just one relay. My advice would be to take some time and see if you can figure out how it works on your own. If you get stuck, I'm sure someone here will be able to help you. Just remember, electricity can only flow in the directiont the arrows are pointing.
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