180-degree kickback

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180-degree kickback is the only other two-glider collision besides the standard kickback that produces a clean output glider with no leftover ash. The 180-degree change in direction is occasionally useful in glider synthesis, but is rarely used in signal circuitry or in self-supporting patterns like the Caterpillar or Centipede, because 90-degree collisions are generally much easier to arrange.

x = 13, y = 18, rule = B3/S23 11bo$10bo$10b3o13$b2o$obo$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART THUMBSIZE 2 HEIGHT 480 WIDTH 480 ZOOM 16 GPS 20 PAUSE 2 T 61 PAUSE 2 LOOP 62 ]]
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