[paulmooreparks]

A 1d row of cells also affects nearby cells above and below the line. Consider a row of three cells:

https://parkscomputing.com/page/conways-game-of-life?boardSi...;

That produces a spinner, because the empty cells above and below the 1d row have three live cells nearby.

[smallerize]

Yes, which is not what adzm asked for.