Write code to read from a file and build datastructure that helps you query products based on their category, title, author etc.
ItemNo , Product No (unique), Title, Author, Category
1 , 00000001, Cracking Coding Interview, Gayle Laakmann McDowell , Books > Business, Finance. Law > Careers > Job Hunting
2 , 000002, The Art of Captaincy, Robert James, Books > Biography > Sport > Cricket
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