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1. Today continue to study arrays. Defining repetitive code and reusable code as functions can improve the aesthetics of the code.
2. Create a numbered list for arrays.
   1. Method 1. Define a counter when printing, increment by 1 each loop.
   2. Method 2. Use the index of a for loop with range.
3. Today's exercise is to complete option 4 of the case study. It's relatively simple, not difficult.