Combining Texts

You have chosen 'An Analysis of Knowledge and Valuation' by C.I. Lewis, 'Two letters on mind' by Ren Descartes and 'The Inference to the Best Explanation' by Gilbert Harman

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All the ideas for Modes of Existence, or select a subheading:
      A. Relations
      B. Properties
      C. Powers and Dispositions
      D. Universals
      E. Nominalism