You may not 'hard code' the division names. This means that the names like 'Toronto Water' should not appear in your code. Consequently, you must find another way to determine what the division names are and to calculate the number of service calls for each one. This is where the 'unique' function can be helpful.
I don't understand your questions about the unique function. Can you explain further?
I don't understand your questions about the unique function. Can you explain further?