Combining Texts

You have chosen 'Are there propositions?' by Gilbert Ryle, 'Reality is Not What it Seems' by Carlo Rovelli and 'On the Concept of Number' by David Hilbert

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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