Hello

This might be a strange question to most, but I'm writing an addon that gives instructions based on world markers, however literally 70% of the script is to allow custom world marker placements. I want to make a "lite" version of the addon that uses four predefined world markers to remove all of that code for the ones who don't need it.

So with that in mind - on to the question! I'm interested to know which four world markers are likely to be the best four to use in order to easily distinguish them all. Are there any colour combinations you struggle to see when using world markers? (White and silver is already being avoided )