My solution to the previous exercise has a horrible performance bug. Because of its use of shuffle, the function takes time proportional to the length of the dictionary instead of the length of the passphrase. For a four-word passphrase and the 3097-word dictionary used in the solution, that’s a three-order-of-magnitude performance bug. Ouch!

Your task is to fix your solution if you got it wrong like I did. 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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