Combining Texts

You have chosen 'Does Emp.Knowledge have Foundation?' by Wilfrid Sellars, 'Tractatus' by Nicholas of Autrecourt and 'Ontological Relativity' by Willard Quine

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature