SECTION 3 LESSON 1
each job may be handled by one or more employees.
each empolyee must handle one or more jobs.
each assigned waiter may take one or more orders.
each order must be taken one assigned waiter.
each parent may pick up one or more children.
each child must be picked up by one parent.
each teacher may teach one or more students.
each student must be taught by one or more teachers.