Input (grade 7): Many burger chains from the United States can be found all over Mexico, including Carl's Jr., Sonic, as well as global chains such as McDonald's and Burger King. Hamburgers in the UK and Ireland are very similar to their US cousins, and the High Street is dominated by the same big two chains as in the U.S. - McDonald's and Burger King.
Output (grade 6): Many food chains, such as Burger King, Wendy's and McDonald's, serve hamburgers.