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<https://anchorfact.org/kb/history/greek-philosophy>
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  schema:headline "Greek Philosophy" ;
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<https://anchorfact.org/kb/history/greek-philosophy>
  schema:citation <https://plato.stanford.edu/entries/socrates/> ;
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<https://anchorfact.org/kb/history/greek-philosophy>
  schema:citation <https://plato.stanford.edu/entries/plato/> ;
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<https://anchorfact.org/kb/history/greek-philosophy>
  schema:citation <https://plato.stanford.edu/entries/aristotle/> ;
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