Return the official native languages of countries who have players from Maryland or Duke colleges.
SELECT T1.Official_native_language FROM country AS T1 JOIN match_season AS T2 ON T1.Country_id  =  T2.Country WHERE T2.College  =  "Maryland" OR T2.College  =  "Duke"
official native languages of countries = T1.Official_native_language; countries who have players from Maryland or Duke colleges refers to WHERE T2.College = 'Maryland' OR T2.College = 'Duke';