Gave it over an hour, couldn’t figure out how to add characters to the map and the proper syntax for loops and addressing particular elements.
Putting this here so that others know not everybody succeeds so that they don’t feel bad. 
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Yeah this was a tough challenge. I failed as well because I was not ready for the [Letter} in LetterSeen[Letter] or how to implement it any other way. Other than that I was able to get everything else right so I am at least making progress.
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