product of a D1 - EBar - B dyad collision

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**Figure:** T20 arises in glider collisions; in this figure a single D1 glider collides with a BBar glider, which was modified just before the impact by a collision with two B gliders which had the effect of extending a T5 on the right edge of the EBar.
$\begin{figure}\centering\begin{picture}(280,380) \put(0,0){\epsfysize =380pt \epsffile{pret20b.eps}} \end{picture}\end{figure}$

Jose Manuel Gomez Soto 2002-05-15