Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Letters to Oldenburg' by Baruch de Spinoza and 'Introducing Persons' by Peter Carruthers

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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