Project 5 router 2 inputs with the same address

can we assume that every address in the table is unique?
meaning is it possible that the same address will be inserted more then once to the table?

If an address appears twice then it does not implement a function.
Hence, addresses are not repeated in the table.

Does that mean that the same address would not be entered twice? or that we need to check if the address already exists before saving it?

You can assume that duplicate addresses won’t be input.