Combining Texts

You have chosen 'Intro to 'Questions of Time and Tense'' by Robin Le Poidevin, 'Introduction to Mathematical Philosophy' by Bertrand Russell and 'On the analysis of moral judgements' by A.J. Ayer

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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