A for all
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A for all  
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Pattern type  Oscillator  

Number of cells  28  
Bounding box  10 × 10  
Period  6  
Mod  3  
Heat  13.3  
Volatility  0.73  
Strict volatility  0.73  
Discovered by  Dean Hickerson  
Year of discovery  1993  
 
 
 

 Not to be confused with Big A.
A for all is a period6 oscillator found by Dean Hickerson on March 6, 1993.^{[1]} Its claimed 13glider synthesis was found by David Buckingham in 1993, but was forgotten about and not revealed until August 1995. This synthesis was later found to be invalid due to gliders crossing paths and replaced with a similar 12glider synthesis which avoids this issue.^{[2]}
About one in 289,000 soups in the correct symmetry (D4_+4) form an A for all.
Similar blockhassling oscillators
These are oscillators that perturb a block on their edge by two diagonallyadjacent cells throughout a full phase, that eventually returns to a block through the outwardfacing grin predecessor.
unnamed p3 (click above to open LifeViewer) Catagolue: here 
O for ball,^{[n 1]} p7 (click above to open LifeViewer) Catagolue: here 
unnamed p8^{[n 2]} (click above to open LifeViewer) Catagolue: here 
See also
Notes
References
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
 ↑ Jeremy Tan (April 18, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
 A for all at the Life Lexicon
 A for all at Adam P. Goucher's Catagolue
 28P6.5 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 28 cells
 Periodic objects with minimum population 28
 Patterns with 28 cells
 Patterns found by Dean Hickerson
 Patterns found in 1993
 Patterns that can be constructed with 12 gliders
 Oscillators
 Oscillators with period 6
 Oscillators with mod 3
 Oscillators with heat 13
 Oscillators with volatility 0.73
 Oscillators with strict volatility 0.73
 Patterns with rectangular orthogonal symmetry
 Nonflipping oscillators that turn 90 degrees
 Flipping oscillators
 Seminatural periodic objects