Combining Texts

You have chosen 'Reply to Fifth Objections' by René Descartes, 'Frege's Concept of Numbers as Objects' by Crispin Wright and 'Moral Thinking: Its Levels,Method and Point' by Richard M. Hare

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All the ideas for Natural Reality, or select a subheading:
      A. Classical Physics
      B. Modern Physics
      C. Space
      D. Time
      E. Cosmology
      F. Chemistry
      G. Biology