Make Shibam Happy

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Shibam is now in final year and so now he has to sell off all the text books that he bought (but were hardly opened) in his first year like Grewal's Higher Engineering Mathematics to Zubair bookstall. But the sad news for Shibam is that Zubair always pays a much less price for taking back the books they only sold. In such a case Shibam will have a huge loss. So one day he thought that instead of

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