Combining Texts

You have chosen 'Intro to 'Questions of Time and Tense'' by Robin Le Poidevin, 'On Sufficient Reason' by Gottfried Leibniz and 'On Carnap's Views on Ontology' by Willard Quine

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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