Question: (Python) Write a program that reads in 1.txt file, coverts all words to lowercase, and prints out all words in the file that contains the

(Python) Write a program that reads in 1.txt file, coverts all words to lowercase, and prints out all words in the file that contains the letter a, the letter b, the letter c, and so on. Build a dictionary whose keys are the lowercase letters, and whose values are sets of words containing the giving letter.

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