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5 lines
189 B

#N Traffic light
#C A common period 2 oscillator made up of four blinkers.
#C www.conwaylife.com/wiki/index.php?title=Traffic_light
x = 7, y = 7, rule = B3/S23
2b3o2b2$o5bo$o5bo$o5bo2$2b3o!