Combining Texts

You have chosen 'Structure and Ontology' by Stewart Shapiro, 'Lecture on Applicability of Mathematics' by Steven Weinberg and 'Substances without Substrata' by N.L. Wilson

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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