Pentadecathlon/Snippet

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Pentadecathlon is a period 15 oscillator that was found in 1970 by John Conway while tracking the history of short rows of cells (see one-cell-thick pattern). Indeed, 10 cells placed in a row quickly evolve into this object, which is the most natural oscillator of period greater than 3. In fact, it is the fifth or sixth most common oscillator overall, being about as frequent as the clock, but much less frequent than the blinker, toad, beacon or pulsar. It is the only known oscillator that is a polyomino in more than one phase (besides the blinker).