#N Middleweight spaceship
#O John Conway
#C A very well-known period 4 c/2 orthogonal spaceship.
#C www.conwaylife.com/wiki/index.php?title=Middleweight_spaceship
x = 6, y = 5, rule = B3/S23
3bo2b$bo3bo$o5b$o4bo$5o!