#N Piston
#C A period 2 oscillator found in 1971.
#C www.conwaylife.com/wiki/index.php?title=Piston
x = 11, y = 5, rule = B3/S23
2o7b2o$obo2bo2bobo$2b4o2bo2b$obo2bo2bobo$2o7b2o!