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[Xu jiagu] lecture_notes_on_mathematical_olympiad_(book_fi.org)
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![[Xu jiagu] lecture_notes_on_mathematical_olympiad_(book_fi.org)](https://cdn.vdocument.in/doc/330x215/53f5675f8d7f728e318b4c59/xu-jiagu-lecturenotesonmathematicalolympiadbookfiorg.jpg)