code of how to count the number of words in a file (excluding duplicates) and the number of times each word is used in the file using loops. No functions can be used to complete this while also including clean_word = re.sub(r'

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Show example code of how to count the number of words in a file (excluding duplicates) and the number of times each word is used in the file using loops. No functions can be used to complete this while also including clean_word = re.sub(r'[^a-z]+', '', word.lower()). Note: the output should just be “there are ___ unique words in the file” 

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