The first puzzle involved 4 levers, but I accessed the barrow before I got the quest. Since i was impatient and didn't want to redo the puzzle I simply flip a switch that closed the door to the levers but opened the exit door while simultaneously leaving the room. Upon re-entering the barrow I learned that I couldn't open the door to the lever room so I couldn't progress any further. I could revert to a previous save to fix this problem.

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