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10 Best Object-Oriented Analysis, Design, and Programming Courses in 2023 | by javinpaul | Javarevisited | Medium
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Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World Of Computational Thinking with Code (Zed Shaw's Hard Way Series): Shaw, Zed: 9780321884992: Amazon.com: Books
Which are the hardest object-oriented concepts that beginners struggle to understand? How would you have explained them? - Quora
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