x = 478, y = 65, rule = B3678/S34678
268boo$266boobo$267b4oboo$264bob8o36bo$263b10obo3booboo22bo4booboo$
262b12obb9o18bobob8o$261b23obo16bobb9obo3boob3o$261b23obo15b14obb7o25b
o$262b12obb9o15b27o15bobobo4boo9bo34b3oboo35b3o$263b10obo3booboo17b27o
16b3ob5obo8bo9boo23b5obo5bo12boo14b3o$264bob8o27b14obb7o15boobob9o4boo
bbobobbo4b5o19b8o4b5o5boob6o13bo$267b4oboo28bobb9obo3boob3o13bob13obb
8obbobobb6o18bob7obb7obob11o26b3oboo$266boobo33bobob8o23b37o19b19ob11o
27b5obo5bo$180boo72b3o11boo35bo4booboo23bob13obb8obbobobb6o18bob7obb7o
bob11o24b8o4b5o5boob3o$179bobobo50boo4bobo10bobo54bo28boobob9o4boobbob
obbo4b5o19b8o4b5o5boob6o13bo9bob7obb7obob8o$179b3obo25booboo20boo6bo
11b5o84b3ob5obo8bo9boo23b5obo5bo12boo14b3o8b19ob8o$179boo27b6o6bo8bobb
4obboboobo6boobb3o85bobobo4boo9bo34b3oboo35b3o8bob7obb7obob8o$179b3o
25bob4obo3b5o4b3obb6oboobboo3boboobbo94bo100b8o4b5o5boob3o$180bo25b8o
bb7o3b11obboobobboobobboo199b5obo5bo$63boo113boobo23b23ob9obo3bo3b3obb
o47bo151b3oboo$64bo113b3o25b13obb7obbobb4obobo6b5o48boo$60bo3bo3boo
111bo25b11obo3b5o3bob3oboboo4boboobobbo45boo$59boob8o109bo28boob8o6bo
8b3o9boobobo67bo130boo$58b11obo3boob3o99boo28bo3bo3boo15b4o12b3o65b3o
128boo$57b13obb8o99bo33bo22bo83bo129bo$56b26o97bo32boo$56b26o99bo$57b
13obb8o98b6o$58b11obo3boob3o98b4obo$59boob8o109bobbo$60bo3bo3boo110boo
$64bo238bobo127bobo$63boo239bo129bo$5bo297bobo127bobo$4boboboo7boboobo
$4b6o6bob3obo29bo$bbob5obo3b9obo26boo$b9obb11obo27boo$25o148b6o$b14obb
o3bob3o145b5oboo33boo$bbobb9obo3booboboo108b3oboo31b4oboboo33bo22bo83b
o129bo$3bobob8o119b5obo5bo9bo12bobobb7o28bo3bo3boo15b4o12b3o65b3o128b
oo$5bo4booboo117b8o4b5o5boboo11bo6b4obo26boob8o6bo8b3o9boobobo67bo130b
oo$10bo90bo29bob7obb7oboboobo12bo10bo27b11obo3b5o3bob3oboboo4boboobobb
o45boo$100boboboo25b19obob4o11boo8boo26b13obb7obbobb4obobo6b5o48boo$
98bob6o6bo18bob7obb7obob4o12boo8boobo23b23ob9obo3bo3b3obbo47bo151b3ob
oo$60booboo32b8obo3b6o16b8o4b5o6boo49b8obb7o3b11obboobobboobobboo199b
5obo5bo$59b6o6bo24b10obb6obo18b5obo5bo7bo26bo25bob4obo3b5o4b3obb6oboo
bboo3boboobbo94bo100b8o4b5o5boob3o$58bob4obo3b5o21b20o19b3oboo68b6o6bo
8bobb4obboboobo6boobb3o85bobobo4boo9bo34b3oboo35b3o8bob7obb7obob8o$57b
8obb7o3bobob3o11b20o94booboo20boo6bo11b5o84b3ob5obo8bo9boo23b5obo5bo
12boo14b3o8b19ob8o$56b23obo4bo10b10obb6obo118boo4bobo10bobo54bo28boobo
b9o4boobbobobbo4b5o19b8o4b5o5boob6o13bo9bob7obb7obob8o$56b23obo4bo11b
8obo3b6o138b3o11boo35bo4booboo23bob13obb8obbobobb6o18bob7obb7obob11o
24b8o4b5o5boob3o$57b8obb7o3bobob3o14bob6o6bo153boobo33bobob8o23b37o19b
19ob11o27b5obo5bo$58bob4obo3b5o26boboboo161b4oboo28bobb9obo3boob3o13bo
b13obb8obbobobb6o18bob7obb7obob11o26b3oboo$59b6o6bo29bo162bob8o27b14o
bb7o15boobob9o4boobbobobbo4b5o19b8o4b5o5boob6o13bo$60booboo198b10obo3b
ooboo17b27o16b3ob5obo8bo9boo23b5obo5bo12boo14b3o$262b12obb9o15b27o15bo
bobo4boo9bo34b3oboo35b3o$261b23obo15b14obb7o25bo$261b23obo16bobb9obo3b
oob3o$262b12obb9o18bobob8o$263b10obo3booboo22bo4booboo$264bob8o36bo$
267b4oboo$266boobo$268boo!
A pseudo-period 260 backwards p4 rake.
The period of the puffer is actually 520, but the output is period 260.
This uses a p16 puffer whose output is turned into a p4 oscillator,   
which is then hit by the smoke from two large spaceships to create
the period 4 spaceship.
David I. Bell, May 1997
