The much more practical courses Confucius learned are____,____,____,____.
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"Ritual and music" were mainly used in____and____.
According to Sima Qian,____________is Lao-tzu's surname, while ____________is his given name.
Lao-tzu's work can be named____,or____or____.
Lao-tzu takes____as central concept and the highest category.
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