Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'The Central Questions of Philosophy' by A.J. Ayer and 'On 'Generation and Corruption'' by Albertus Magnus

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All the ideas for Modes of Existence, or select a subheading:
      A. Relations
      B. Properties
      C. Powers and Dispositions
      D. Universals
      E. Nominalism