#N Pre-pulsar shuttle 47
#C A period 47 shuttle oscillator that works by hassling two pre-pulsars.
#C www.conwaylife.com/wiki/index.php?title=Pre-pulsar_shuttle_47
x = 31, y = 30, rule = b3/s23
11bo7bo11b$10bobo5bobo10b$11bo7bo11b4$6bo17bo6b$6bo17bo6b$6bo17bo6b$2b
2o23b2o2b$bobo7b3o3b3o7bobob$bo8bo3bobo3bo8bob$2o27b2o2$7b2o13b2o7b$7b
2o13b2o7b2$2o27b2o$bo8bo3bobo3bo8bob$bobo7b3o3b3o7bobob$2b2o23b2o2b$6b
o17bo6b$6bo17bo6b$6bo17bo6b4$11bo7bo11b$10bobo5bobo10b$11bo7bo!