Honduran Milk Snake Genetics - Extreme?

I’m new to Honduran Milk Snakes but have quickly fallen in love with them. Trying to understand the genetics behind some morphs is kind of confusing however.

So I understand these ones: Hypo, Albino, Anery, Tricolor, Vanishing Pattern and Tangerine (along with combinations of these)

The one I don’t quite understand is the Extreme. How does one differentiate them? Does anyone have any information of them? Thanks!

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