#N Pulsar
#O John Conway
#C A period 3 oscillator. Despite its size, this is the fourth most common oscillator (and by
#C far the most common of period greater than 2).
#C www.conwaylife.com/wiki/index.php?title=Pulsar
x = 13, y = 13, rule = B3/S23
2b3o3b3o2b2$o4bobo4bo$o4bobo4bo$o4bobo4bo$2b3o3b3o2b2$2b3o3b3o2b$o4bob
o4bo$o4bobo4bo$o4bobo4bo2$2b3o3b3o!