Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Logical Properties' by Colin McGinn and 'Launching Points to the Realm of the Mind' by Porphyry

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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