Combining Texts

You have chosen 'Psychophysical and theoretical identifications' by David Lewis, 'What do powers do when they are not manifested?' by Stathis Psillos and 'Comments on a Certain Broadsheet' by Ren Descartes

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature