Combining Texts

You have chosen 'On 'Generation and Corruption'' by Albert of Saxony, 'Merely Possible Propositions' by Robert C. Stalnaker and 'Tarski on Truth and Logical Consequence' by John Etchemendy

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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