Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'Letters to Varignon' by Gottfried Leibniz and 'A Tour through Mathematical Logic' by Robert S. Wolf

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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