Combining Texts

You have chosen 'The Problem of Empty Names' by Marga Reimer, 'On Minerals' by Albertus Magnus and 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton

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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