• https://www.convert-me.com/en/convert/hex_octal_binary_roman/numdec/numdec-to-numroman.html
• https://www.dcode.fr/roman-numerals#q11

So if we believe the adage, „when in Rome do as the Romans do,” and we see how the Romans write numerals, then it clearly gives us much more freedom than many would care to admit. https://projecteuler.net/about%3Droman_numerals