Find the id of the customers who have order status both "On Road" and "Shipped".
return customers ;return orders of  #1 ;return status of  #2 ;return #1 where  #3 is  On Road ;return #1 where  #3 is  Shipped ;return #1 of  both #4 and #5 ;return ids of  #6
['select', 'project', 'project', 'comparative', 'comparative', 'intersection', 'project']