Combining Texts

You have chosen 'The Problem of the Essential Indexical' by John Perry, 'Concepts and Counting' by Ian Rumfitt and 'Survival and Identity, with postscript' by David Lewis

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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