Combining Texts

You have chosen 'Psychophysical and theoretical identifications' by David Lewis, 'Types and Ontology' by Fred Sommers and 'Whitehead and the Rise of Modern Logic' by Willard Quine

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All the ideas for Objects, or select a subheading:
      A. Existence of Objects
      B. Unity of Objects
      C. Structure of Objects
      D. Essence of Objects
      E. Objects over Time
      F. Identity among Objects