Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Exigency to Exist in Essences' by Gottfried Leibniz and 'The Nature of Existence vol.1' by J.M.E. McTaggart

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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