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|Number of cells||18|
|Year of discovery||Unknown|
The great on-off (or pincers) is a period 2 oscillator. It is the ninth most common naturally-occurring oscillator, being less common than the quadpole but more common than the figure eight. It has the same rotor as the beacon.
- Stephen Silver. "Pincers". The Life Lexicon. Retrieved on May 1, 2009.
- Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.