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|Number of cells||21|
|Year of discovery||Unknown|
Hooks is a period 5 oscillator that is shown as the second pattern in the third row of Jason Summers' main period 5 collection. It is also shown as the first pattern in the fourth row of Jason Summers' period 5 billiard collection.
- 21P5.2 at Heinrich Koenig's Game of Life Object Catalogs