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[M2] (golly 2.0)
#C Without the block, this is Gosper's "total aperiodic"
#C pattern (Nov '97), in which every cell in the universe
#C eventually becomes aperiodic.
#C With the block, every cell eventually becomes periodic,
#C but incredibly slowly. The block remains untouched for
#C very roughly 3^63 generations. It deletes the nth glider
#C (and is shifted) at about generation 3^(57.5+5.5n).
#C Bill Gosper, 24 Jun 2004
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