Combining Texts

You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'Letters to Samuel Masson' by Gottfried Leibniz and 'Notes on John Wilkins' by Gottfried Leibniz

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge