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102 Chapter10. Lists
thinkpython2. com/ code/ interlock. py . Credit: This exercise is inspired by an example at http: // puzzlers. org .
1. Write a program that finds all pairs of words that interlock. Hint: don’t enumerate all pairs!
2. Can you find any words that are three-way interlocked; that is, every third letter forms a word, starting from the first, second or third?
