Which customers have both "On Road" and "Shipped" as order status? List the customer ids.
return customers ;return orders of #1 ;return statuses of #2 ;return #1 where #3 is On Road ;return #1 where #3 is Shipped ;return #1 in  both #4 and  #5 ;return customer ids of #6
['select', 'project', 'project', 'comparative', 'comparative', 'intersection', 'project']