How do you find out how many things a place has if they have one of everything?

To determine how many things a place has when it claims to have one of everything, you would need to identify the categories or types of items present and count each distinct category. For example, if the place has one of each type of animal, plant, or artifact, you would tally the total number of these categories. Alternatively, if there is a list or inventory available, reviewing that document would provide the exact count.