Combining Texts

You have chosen 'What is so bad about Contradictions?' by Graham Priest, 'Mathematical logic and theory of types' by Bertrand Russell and 'Inventing Logical Necessity' by Crispin Wright

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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