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catback's circuit should work if you get the resistor values right. It might work better if the LED with two resistors in the path has a diode added in series.
Idea is when the LED with one resistor is on (the LED with the switch in the path)
the current is high enough to cause a voltage drop large enough to not allow the other LED to light. Adding a diode in series with this leg of the circuit might allow the two LEDs to have a similar brightness by not requiring the first resistor to be so large.
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