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New Contributor

Book and card

   Dear Mr/Ms

       My name is Thi Tran. I bought your product. Now I need some information.

       I have a book, I have a card, but my classcourse doesn't use this card. I have a book question as picture.  I don't have any course class. I want to check the expalnation example in the book. How can I do?

    Would you like to instruct me how to check solution for my problem? I appreciate your response.

I am looking forward to hearing from you. 

   

 

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