product of a double D1 - C2 - B triad collision

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**Figure:** T20 arises in glider collisions; in this figure a double D1 glider collides with a single C2 glider, which is enhanced at the moment of impact by three B gliders. Varying the number of these gliders changes the size of the large triangle produced.
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Jose Manuel Gomez Soto 2002-05-15