#N Caterer on 42P7.1
#O Unknown
#C The smallest known period-21 oscillator, non-trivial because
#C it contains one cell that oscillates at the full period
#C www.conwaylife.com/wiki/Caterer_on_42P7.1
#C www.conwaylife.com/patterns/catereron42p7.1.rle
x = 17, y = 14, rule = B3/S23
3b2o5b2o$2o2bo7bo$bobo5bo$bob2o4bo3bo$2o7bo3b4o$2b2o7bo$2bo2bo$3b3o$6b
2o$3b2obo3bob2o$3b2obobob2obo$7b2o$9b4o$9bo2bo!