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Period 4

Figure: : Another cycle for an eight cell ring twice repeated.  

Cycles of period four occur in a variety of forms during evolution according to Rule 22, although only one of them makes its appearance in the context of a sixteen cell ring (as a doubled eight cell ring), as shown in Figure gif. They all evolve from a pair of cells with small gaps, which can sometimes sum up to produce the same ring length in different ways.

Harold V. McIntosh