Sparking eater

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A sparking eater is one of two eaters found in April 1997 and November 1998 by Dean Hickerson using his dr search program, shown below to the left and right respectively. These both absorb gliders as a standard eater does, but also produce separated single-bit sparks at the upper right, which can be used to delete antiparallel gliders with different phases as shown.

In general it can mean any eater that produces a glider-eating spark.

x = 56, y = 16, rule = B3/S23 2bo29bo$obo27bobo$b2o28b2o6$9b2o2b2o25b2o2b2o$6bo3bo2b2o22bo3bo2b2o$6b 4o12b2o9b2o2b4o12b2o$21b2o10bo19bobo$6b2o15bo10b5o14bo$6b2o31bo$36b3o$ 36bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 320 X -1 Y -4 THEME 6 GPS 10 LOOP 288 ZOOM 8 PAUSE 2 AUTOSTART ]]
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RLE: here Plaintext: here

The above mechanisms can be used to build intermitting glider guns. The left-hand eater produces a spark nine ticks after a glider impact, with the result that the period of the constituent guns can't be a multiple of 4. The right-hand eater produces the same spark ten ticks after impact, which allows p4N guns to be used.

The separation of the spark also allows this reaction to perform other {perturbation}s "around the corner" of some objects. For example, it was used by Jason Summers in 2004 to cap the ends of a row of ten AK47 reactions to form a much smaller period 94 glider gun than the original one. (This is now made obsolete by the AK94 gun.)

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