Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz and 'The Will to Power (notebooks)' by Friedrich Nietzsche

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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