four left in six generations

There are two more glider situations in the sixth generation. Both are based on the T5 triangle as a base piece, but since its use with the two gliders are diagonal reflections of one another, there probably isn't a clear coexistence situation in which one can overtake the other and produce nice simple collisions. That's something that still has to be tried, however.

In the first combination, there is a shift of four cells after six generations. The two different tiles needed to make up two species are are:

  

Figure 2.5: One species moves 4 left every six generations against a background generated by the other.

To tile the plane and thus construct an evolution, make diagonals from either tile:

  

Figure 2.6: The second species is the glider, moving against a background established by the first.

  

Figure 2.7: The first species is the glider, moving against a background established by the second.

  

Figure 2.8: The de Bruijn diagram for shifting four cells left in six generations shows the ways in which one of the species can move within a background generated by the other, and all the combinations in between.