Why does second of -which is at immediate before comma- use in the sentence below?

What does it specify? (which subject, object or etc.)

In Spain, as in the rest of world that I know of, the VAT tax (value added) is included in the price.

This is one of the questions that makes me confused.

Thank you very much in advance.


"Know of" is a phrasal verb consisting of a verb "know" and a preposition "of." It's normally followed by a noun phrase as a complement.

However, a preposition, when used with a relative clause, like this one, it can be stranded (used without a following complement).

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