What are the official languages of the countries of players from Maryland or Duke college?
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 languages refers to Official_native_language; countries of players from Maryland or Duke college refers to condition WHERE T2.College = 'Maryland' OR T2.College = 'Duke';