Combining Texts

You have chosen 'Possible Worlds' by Robert C. Stalnaker, 'New System and Explanation of New System' by Gottfried Leibniz and 'A world of truthmakers?' 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