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代數(shù)圖論-第2版 
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Many authors begin their preface by confidently describing how their book arose.We started this project so long ago， and our memories are so weak， that we could not do this truthfully.Others begin by stating why they decided to write.Thanks to Freud， we know that unconscious reasons can be as important as conscious ones， and so this seems impossible， too.Moreover， the real question that should be addressed is why the reader should struggle with this text.
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