Every customer has a customer number, arrival time, waiting time, transaction time, and departure time.
true
false

What are procedures that keep a data base current

Whose task it is to ensure that the product flows logically from one step to another?

Description: write function lastfirst() that takes one argument—a list of strings of the format "lastname, firstname" —and returns a list consisting of two lists: (a) a list of all the last names (b) a list of all the first names