#C A period 2640 rocket gun which is the basis for a series of rocket guns
#C having all periods of the form 264 + 8N.  It uses period 8 spark oscillators
#C which form a rectangular channel for a rocket to make a loop.  One corner
#C is modified to emit an output rocket whenever the inside rocket passes by.
#C
#C The period of this gun is factored as 33 * 8 * 10, so that the loop can
#C contain ten evenly spaced rockets, and the resulting gun will still work,
#C and will then have period 264.
#C
#C In the period 2640 gun, the right half can be moved to the right by any
#C multiple of 20 cells, and the period is then increased by multiples of 80
#C generations.  Since 80 is 8 * 10, the resulting larger loop still supports
#C ten evenly spaced rockets.  Furthermore, when the loop is populated with
#C ten rockets, the period is incremented by only 8 generations instead of 80.
#C Therefore, rocket guns of all periods of the form 164 + 8*N can be built
#C from this basic gun.
#C
#C David I. Bell, December 1999
#C
x = 501, y = 110, rule = B3678/S34678
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