B gliders can approach an F glider from four alignments.
|1||BBar + F|
|2||D + A dimer|
|3||B + F|
|4||BBar + F|
There are four relative alignments between B and F gliders, two of which exchange the gliders for a BBar5 and an F, one of which is solitonic, and one of which leaves a residue travelling to the right.