CREATE TABLE table_78773 ("Date" TEXT, "Round" TEXT, "Opponent" TEXT, "Venue" TEXT, "Result" TEXT, "Attendance" FLOAT, "Scorers" TEXT)

What round was the game with a result of 5-1 at N venue?
SELECT "Round" FROM table_78773 WHERE "Venue" = 'n' AND "Result" = '5-1'
SELECT "Round" FROM "table_78773" WHERE "Result" = '5-1' AND "Venue" = 'n'