Combining Texts

You have chosen 'On Nature Itself (De Ipsa Natura)' by Gottfried Leibniz, 'Papers of 1918' by Bertrand Russell and 'Attitudes De Dicto and De Se' by David Lewis

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction