Combining Texts

You have chosen 'The Problem of Empty Names' by Marga Reimer, 'Letters to Pierre Bayle' by Gottfried Leibniz and 'The Nature and Communication of Substance' 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