Combining Texts

You have chosen 'The Identity of Indiscernibles' by Max Black, 'On 'The Beginning of Philosophy'' by Ludwig Feuerbach and 'Comment on Armstrong and Forrest' 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