#N Blocked p4-1
#O Adam P. Goucher
#C A period 4 oscillator.
#C www.conwaylife.com/wiki/Blocked_p4-1
x = 23, y = 14, rule = b3/s23
11bo11b$4bo3bo5bo3bo4b$3bobo11bobo3b$3bobo11bobo3b$2obobob9obobob2o$2o
bo15bob2o$3bo15bo3b$3bobo4bobo4bobo3b$4bobob3ob3obobo4b$2bobob2o7b2obo
bo2b$2b2o5b2ob2o5b2o2b$10bobo10b$10bobo10b$11bo!