T-nosed p4 is a period 4 oscillator that was found in October 1989 by Robert Wainwright. It can be used as a filter that deletes every other lightweight spaceship in a stream of period 4n + 2.
A variant based on the overweight emulator is shown below.
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- ↑ "Filter". The Life Lexicon. Stephen Silver. Retrieved on March 15, 2009.
- 31P4.1 at Heinrich Koenig's Game of Life Object Catalogs