x = 39, y = 19, rule = B3678/S34678
19bo$$19bo$$19bo$7b3o19b3o$4boo5b4o4bo4b4o5boo$3bobb5o4b4ob4o4b5obbo$b
6o3b19o3b6o$b18ob18o$7o3b19o3b7o$oobobb5o4b4ob4o4b5obboboo$4boo5b4o4bo
4b4o5boo$7b3o19b3o$19bo$$19bo$$19bo!
A period 48 spark oscillator.
The spark can become two bits if the central column is duplicated.
Dean Hickerson, April 1997
