Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'The Structure of Empirical Knowledge' by Laurence Bonjour and 'Sense Data and the Percept Theory' by Roderick Firth

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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