"Friend"
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Garland walks into the library and asks the librarian if they perhaps had a multilingual dictionary. If so, he looks up how to say the word "friend" in different languages. After this, he also inquires as to whether it would be possible to unlock doors by speaking. And if so, if there is any recorded history of one near Arabel
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He refines his research to focus more on Gnomish and Undercommon
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The librarian suggests he goes and finds someone who speaks these languages.