CREATE TABLE table_16663 ("Round" FLOAT, "Grand Prix" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

what are all the report where winning constructor is williams - renault and grand prix is south african grand prix
SELECT "Report" FROM table_16663 WHERE "Winning Constructor" = 'Williams - Renault' AND "Grand Prix" = 'South African Grand Prix'
SELECT "Report" FROM "table_16663" WHERE "Grand Prix" = 'South African Grand Prix' AND "Winning Constructor" = 'Williams - Renault'