Combining Texts

You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'The Foundations of Empirical Knowledge' by A.J. Ayer and 'Confessio naturae contra atheistas' by Gottfried Leibniz

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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