Although glider collisions and puffer trains are not the real province of de Bruijn diagrams, some information can occasionally be gleaned from them. For instance ``black hole'' configurations are often interpretable as collisions. Just manually adjusting the coexistence of A and B gliders, it looks like they should begin to collide in the generation-9 de Bruijn diagrams. These are still within computational limits, being 16 times as big as the generation-7 diagrams, but will involve millions of nodes.
However, two kinds of collision are easily described, and are discussed below. Besides the A - B collisions and the A - C collision converting into an F, there is the whole class of collisions by which B gliders extend the E or G gliders, but which has already been incorporated in the foregoing analysis.