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You should tell him that it is wrong to do so. he needs to be informed about property and how to take care of things. he must be informed until he is sorry and says he'll never repeat it again.\

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Then i will

1) inform it to the 

2) ask him to say sorry and pay fine to the library.

3) inform this about this to his parents about his behaviour.

4) give him instruction about the value of the books.

5) tell him that books are the true friend of a person.