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Patterns generated by a sequence of two-dimensional cellular automaton rules. The patterns are produced by starting from a single black square and then running for 22 steps. In each case the base 2 digit sequence for the code number specifies the rule as follows. The last digit specifies what color the center cell should be if all its neighbors were white on the previous step, and it too was white. The second-to-last digit specifies what happens if all the neighbors are white, but the center cell itself is black. And each earlier digit then specifies what should happen if progressively more neighbors are black. (Compare page 60.)

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From Stephen Wolfram: A New Kind of Science [citation]