new_contents: class Employee:
      def method(self):
          print('employee.method')
  
  class Engineer(Employee):
      def method(self):
          print('engineer.method')
  
  bob = Employee()
  sue = Employee()
  tom = Engineer()
  
  company = [bob, sue, tom]
  for employee in company:
      employee.method()
  
subject: add the third example