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B - E collisions

Only one approach is possible, and invariably promotes $E_n$ to $E_{n+1}$. Any number of B's can approach an En with arbitrary separations between them, without affecting the final result.

Figure 3.25: A swatch of $E5$ glider, including the $B$'s which extended it from $E1$.
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Jose Manuel Gomez Soto 2002-01-31