Combining Texts

You have chosen 'A Problem about Substitutional Quantification?st1=Saul A. Kripke' by , 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Structure and Ontology' by Stewart Shapiro

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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