Combining Texts

You have chosen 'Three Dialogues of Hylas and Philonous' by George Berkeley, 'Reply to Sixth Objections' by Ren Descartes and 'True in Theory, but not in Practice' by Immanuel Kant

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories