Combining Texts

You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'On boundary numbers and domains of sets' by Ernst Zermelo and 'The Facts of Causation' by D.H. Mellor

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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