#N Tumbling T-tetson
#O Robert Wainwright
#C A period 8 oscillator consisting of two figure eights hassling a T-
#C tetromino.
#C www.conwaylife.com/wiki/index.php?title=Tumbling_T-tetson
x = 21, y = 10, rule = 23/3
b3o17b$o18b2o$o3bo12bob2o$o2bobo10bo4b$2bobo2bo11bob$3bo3bo7b2obo2b$7b
o7b2o4b$4b3o4bo9b$9b2o10b$11bo!