Hi EDM. No diffuculty really. It's not so hard, it just takes a bit of time and effort mulling over possibilities. N S E __ of course would be W for west. It can be anything though, and that's the tough part. That's also why I lent clues. They can be clues to the sequence itself or to the specific missing letter/ word. Consider relationships, well known phrases, people, symbolic progressions, etc. ANYTHING GOES!!!