CREATE TABLE table_39916 ("Club" TEXT, "Played" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Points difference" TEXT, "Tries For" TEXT, "Tries Against" TEXT, "Try Bonus" TEXT, "Losing Bonus" TEXT, "Points" TEXT)

What is the Points with a Tries For that is 21?
SELECT "Points" FROM table_39916 WHERE "Tries For" = '21'
SELECT "Points" FROM "table_39916" WHERE "Tries For" = '21'