CREATE TABLE table_41783 ("Date" TEXT, "Score" TEXT, "Set 1" TEXT, "Set 2" TEXT, "Set 3" TEXT, "Set 4" TEXT, "Set 5" TEXT, "Total" TEXT)

What is Set 4, when Set 5 is NA, and when Set 3 is 19-25?
SELECT "Set 4" FROM table_41783 WHERE "Set 5" = 'na' AND "Set 3" = '19-25'
SELECT "Set 4" FROM "table_41783" WHERE "Set 3" = '19-25' AND "Set 5" = 'na'