Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Letters to Antoine Arnauld' by Gottfried Leibniz and 'Dialogue on human freedom and origin of evil' 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