Combining Texts

You have chosen 'Probability and Logic of Rational Belief' by Henry E. Kyburg Jr, 'Critique of the Gotha Program' by Karl Marx and 'Letters to Fichte' by Friedrich Jacobi

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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