#C A period 8 spark oscillator.
#C This has an internal "slab" which stops the sparks from one side of
#C the standard period 8 spark oscillator.  The spark can be made into a
#C double cell spark by duplicating the center column.
#C David I. Bell, January 2000
x = 15, y = 10, rule = B3678/S34678
7bo$$7bo$$7bo$bb5ob5o$15o$7ob7o$bb11o$4b3ob3o!
