human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Player, Nationality, Jersey Number(s), Position, Years, From
###Question: What years did the united states player with a jersey number 25 who attended delaware state play?
gpt
SELECT Years FROM table WHERE Nationality = united states AND Jersey Number(s) < 25 AND From = delaware state