Combining Texts

You have chosen 'The Universe as We Find It' by John Heil, 'Mirror Mirror - Is That All?' by Robert van Gulick and 'The Blue and Brown Notebooks' by Ludwig Wittgenstein

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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