Combining Texts

You have chosen 'works' by Sigmund Freud, 'Identity in Substances and True Propositions' by Gottfried Leibniz and 'On boundary numbers and domains of sets' by Ernst Zermelo

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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