a snake can be het for as many genes as it parents has to pass on to it.
if you take a clown and breed it with an albino all the offspring will be double het for albino and clown, if you bred an hypo clown with a snow all the offspring would be quad het for hypo clown axantic and albino.
basicly just look at hets the same as you look at codoms. a pastel is basicly het for a super pastel, and if you breed a pastel to a normal you get 50% chance of having a pastel. same with that 100% het only thing is you can look and tell which is the het when you breed het to a normal. but same as when you breed pastel to pastel the odds of getting a super pastel are the same odds of getting a albino from breeding a 100% het albino to a 100% het albino.
when you get to the 50% hets it just means that a 100% het was bred to a normal so you can look and see if you hit the odds or not.