CREATE TABLE table_35721 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Jockey" TEXT, "Winner/2nd" TEXT)

What was the race of the jockey in na group in 4th place?
SELECT "Race" FROM table_35721 WHERE "Group" = 'na' AND "Result" = '4th'
SELECT "Race" FROM "table_35721" WHERE "Group" = 'na' AND "Result" = '4th'