Combining Texts

You have chosen 'On the Philosophy of Logic' by Jennifer Fisher, 'Of liberty, Fate and God's grace' by Gottfried Leibniz and 'On the Plurality of Worlds' 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