Combining Texts

You have chosen 'Writing the Book of the World' by Theodore Sider, 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess and 'The Essential Child' by Susan A. Gelman

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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