Combining Texts

You have chosen 'The World as Will and Idea' by Arthur Schopenhauer, 'The Search After Truth' by Nicolas Malebranche and 'The Nature of Mathematical Knowledge' by Philip Kitcher

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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