So how the folders work is pretty simple: whichever color on the snake is most dominant (say 3/4 of its color) is the color folder it should be put into. If a snake is a even mix of two or more colors, into the Mixed folder.
Not too strict about it, but that's the general idea.
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So, without further ado, have fun, and remember to treasure these beautiful creatures as everybody should. They're beautiful, elegant, thrilling, and a lot are really damn cute as well.