Combining Texts

You have chosen 'On the Question of Absolute Undecidability' by Peter Koellner, 'Psychology from an empirical standpoint' by Franz Brentano and 'Occasions of Identity' by Andr Gallois

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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