Guess a role with /guess, you get 5 guesses. Afterwards, show your result with /result. Roles are categorized by 4 attributes: team (town, wolf, solo, ua), version added in (see a list in /list), category (Transformation & Align > Killing & Recruitment > Group > Investigative > Power > Miscellaneous) and status (default, limited, deleted). If you get the first four columns right, but the role isn't right, an additional column for the first letter of the role name is added.
technically Cryptographer never even got added to the role book, but I included it since it was fairly recent. It was added just for that one Cryptographer game and we haven't found a way to make a role like it work without relying on the very specific set up. If we do think of something it may eventually become a more permanent role