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Each pair of LEDs is its own circuit in parallel back to the 9 Volt battery with a 560 ohm current limiting resistor in series with the two leds. However it will be specific to the LEDs you use, see https://www.sparkfun.com/tutorials/219https://www.sparkfun.com/tutor... for a reference.

3 sets of these, one in each jowl, one in the rear insert.