Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Introduction to Mathematical Logic' by Michal Walicki and 'The Emotions' by Peter Goldie

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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