CREATE TABLE table_name_70 (set_3 VARCHAR(255), set_2 VARCHAR(255), set_1 VARCHAR(255))
What is the Set 3 when the Set 2 is 21–25, and a Set 1 is 25–21?
    
SQL: SELECT set_3 FROM table_name_70 WHERE set_2 = "21–25" AND set_1 = "25–21"