Write a lex program that examines the words in an ascii, Ask an Expert

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Write a Lex program that examines the words in an ASCII file and lists the ten most frequently used words. Your program should ignore case and should ignore words that appear in a predefined "don't care" list. What changes in your program are needed to make it recognize singular and plural nouns (for example, cat and cats) as the same word? How about different verb tenses (walk versus walked versus walking)?

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