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578 B

#N Glider symmetric PPS
#C A period 30 c/5 orthogonal spaceship in which a pre-pulsar is pushe
#C d by two spiders. An extra T-tetromino also appears between the two
#C spiders.
#C www.conwaylife.com/wiki/index.php?title=Pre-pulsar_spaceship
x = 69, y = 13, rule = b3/s23
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o3bo2bo3bo3bo15bo3bo3bo2bo3bo2bo3bo3bo$o3bobob3o5b3obobo3bo3b3o9bo3bob
ob3o5b3obobo3bo$o5b2o2b3ob3o2b2o5bo4bo10bo5b2o2b3ob3o2b2o5bo$2ob3o15b
3ob2o15b2ob3o15b3ob2o$o25bo15bo25bo$bo3bo15bo3bo17bo3bo15bo3bob$2bo2bo
15bo2bo19bo2bo15bo2bo!