#N Switch engine ping-pong #O Michael Simkin #C The smallest known pattern, that exhibits quadratic population #C growth, as of December 2014. #C www.conwaylife.com/wiki/Switch_engine_ping-pong x = 210515, y = 183739, rule = B3/S23 1148bo$1148b2o1076$145bo$144bo$144b3o158$3bo$b2o$o$bo182353$210513bo$ 210512bo$210512b3o141$210354bo$210353b3o$210355bo!