Okay, so the thing to remember here is that even though we use AES to construct larger PRFs and the output of these PRFs is gonna be 128 bits, it doesn't mean that the MAC itself has to produce 128 bit tags We can always truncate the outputs to 90 bits or 80 bits, and as a result, we would get still secure MACs but now the output tag is gonna be more reasonable size and doesn't have to be the full 128 bits. 