#N Cis-beacon and anvil
#C A period 2 oscillator.
#C www.conwaylife.com/wiki/index.php?title=Cis-beacon_and_anvil
x = 7, y = 9, rule = b3/s23
3b2o2b$4bo2b$bo5b$b2o4b2$b4o2b$o4bob$b3obob$3bob2o!