#N Wavefront
#O David Buckingham
#C A period 4 oscillator found no later than 1976.
#C www.conwaylife.com/wiki/index.php?title=Wavefront
x = 13, y = 13, rule = 23/3
8b2o3b$8bo4b$9bo3b$8b2o3b$5b2o3b2ob$4bo2b3o2bo$4bo5b2ob$5bo3bo3b$2obob
o3bo3b$ob2obob2o4b$4bobo6b$4bobo6b$5bo!