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What does AB and PP tags means?

I was trying the swedish grammar analyzer and I saw one word was marked AB and PP. What does that mean?

“Han åkte bil av olika skäl.”
Here is av marked AB and PP. Does PP means preposition?

Yes, very likely. No idea about AB though. The tag documentation is unfortunately incomplete.

“Han såg ut som en kanon.”

Strange here is som marked as PN and AB.