Well.... From what I've seen a Lesser + Butter is an all white snake, I'd say that there is no Lesser in that one. Fire is tough as well, the best way is to compare the entire clutch and the lighter / brighter snakes will have Fire in them assuming one of the parents had it. I'm not sure about the Fire, but it looks like a normal Butter to me. Butters are so variable, it could have Fire in there... I'd have to see the siblings.
Nuclear = Butter + Fire (no Lesser in Nuclear)
I actually have a Fire Pied ball python. It had really intense colors when it was young but now is really light / faded / washed out.
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