#N Heavyweight spaceship
#O John Conway
#C A very well-known period 4 c/2 orthogonal spaceship.
#C www.conwaylife.com/wiki/index.php?title=Heavyweight_spaceship
x = 7, y = 5, rule = B3/S23
3b2o2b$bo4bo$o6b$o5bo$6o!