Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Pacidius Philalethi dialogue' by Gottfried Leibniz and 'Building Blocks of Mathematical Logic' by Moses Schnfinkel

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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