Combining Texts

You have chosen 'Intro to 'Questions of Time and Tense'' by Robin Le Poidevin, 'Preface to 'Principles of Philosophy'' by Ren Descartes and 'Non-Monotonic Logic' by G. Aldo Antonelli

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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