STEP 13: To prevent finding the same letter guess again, let's make the letter uppercase.

• Append .upper() to the recent code, like this: word_list[letter_index] = letter_guess.upper()

Using .upper() prevents us from finding the same letter over and over. Because we use .lower() when the user guesses a letter, we know that the guess will never match the same letter in uppercase. Specifically, now word_list.index(letter_guess) won't find the same letter twice.

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