#N Cis-beacon and dock
#C A period 2 oscillator.
#C www.conwaylife.com/wiki/index.php?title=Cis-beacon_and_dock
x = 6, y = 8, rule = B3/S23
3b2ob$4bob$bo4b$b2o3b2$b4ob$o4bo$2o2b2o!