Combining Texts

You have chosen 'Katzav on limitations of dispositions' by Brian Ellis, 'On Political Reactions' by Benjamin Constant and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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