Combining Texts

You have chosen 'The Evolution of Modern Metaphysics' by A.W. Moore, 'Twilight of the Idols' by Friedrich Nietzsche and 'On the Syllogism IV' by Augustus De Morgan

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds