Rule 22

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Rule 22
Typical pattern in rule 22
Number 22
Character Chaotic

Wolfram's Rule 22 is the 2-state 1-D cellular automaton in which a cell is ON in the next generation if and only if exactly one of its three neighbours is ON in the current generation (a cell being counted as a neighbour of itself). This is the behaviour of Life on a cylinder of width 1.

Unlike Rule 90, Rule 22 is capable of explosive growth given a sufficiently chaotic input.

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