CREATE TABLE table_37956 ("Date" TEXT, "Time" TEXT, "Score" TEXT, "Set 1" TEXT, "Set 2" TEXT, "Set 3" TEXT, "Total" TEXT)

Which Set 2 has a Set 3 of 20 25?
SELECT "Set 2" FROM table_37956 WHERE "Set 3" = '20–25'
SELECT "Set 2" FROM "table_37956" WHERE "Set 3" = '20–25'