#N Karel's p15
#O Karel Suhajda
#C A period 15 oscillator discovered on December 11, 2002
#C http://www.conwaylife.com/wiki/index.php?title=Karel's_p15
x = 10, y = 11, rule = b3/s23
2bo4bo2b$2b6o2b$2bo4bo2b4$2b6o2b$bo6bob$o8bo$bo6bob$2b6o!