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xkcd #2937: Room Code
(imgs.xkcd.com)
Alt text:
Sorry to make you memorize this random string of digits. If it helps, it can also double as a mnemonic for remembering your young relatives' birthdays, if they happened to have been born on February 5th, 2018.
Ah, the major system. I have a slightly different version: 1 is L, 5 is f/v (FiVe) and 8 is ch/J. Sun, sci-fi, lichee maybe.