Here’s Matts current list for ball pythons - Allelic Morphs aka Complexes
Think of it as a big long table at a restaurant with planned seating, where couples must sit opposite each other.
This layout doesn’t allow for polyamorous (more than 2) partners to sit together.
So if genes entering the restaurant are YB, Asphalt and Gravel (in the same complex) they will need to play rock, paper scissors to see who is going home.