cellular automotas

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http://mathworld.wolfram.com/Rule30.html

Rule 30 -- from order to randomness

One of the elementary cellular automaton rules introduced by Stephen Wolfram in 1983 (Wolfram 1983, 2002). It specifies the next color in a cell, depending on its color and its immediate neighbors.

Elementary Cellular Automaton

http://mathworld.wolfram.com/ElementaryCellularAutomaton.html The simplest class of one-dimensional cellular automata .