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The patterns on the left were run with periodic boundaries and the red cells show the limit of the pure pattern. On the right the green cells show the limit of the pure area when active boundaries are used. The middle is a cropped pure pattern with both the red and green triangles for reference comparison.

Rule 030

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 073

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 090

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 124

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 169

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 181

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 186

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 188

Periodic boundary

  

Pure, cropped

  

Fixed active boundary
Rule 193

Periodic boundary

  

Pure, cropped

  

Fixed active boundary