Combining Texts

You have chosen 'Philosophical Essay on Probability' by Pierre Simon de Laplace, 'The Passions of the Soul' by Ren Descartes and 'The Sign of Four' by Arthur Conan Doyle

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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