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You'll think of the hexagonal lattice as a distorted rectangular lattice.
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The neighbors of cells in odd-numbered rows are the N,S,E,W neighbors, plus NW and SW.
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The neighbors of cells in even-numbered rows are the N,S,E,W neighbors, plus NE and SE.
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The CA starts with all off cells, except for the center cell, which is on.
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In each time step, each off cell becomes on if exactly one neighbor is on.
