In his 936th xkcd comic strip, Randall Munro described what is wrong with common passwords and suggested a method of passphrase generation that is simpler to use and provides greater security. Unfortunately, I know of no popular websites that permit xkcd-style passphrases. I do still recall, however, the xkcd-style passphrase that CompuServe assigned me about twenty-five years ago (does anyone else remember upgrading from a 1200 baud modem to 9600 baud?)

Your task is to write an xkcd-style passphrase generator. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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