Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'Ontology and the Ambitions of Metaphysics' by Thomas Hofweber and 'Rule Utilitarianism and Euthanasia' by Brad W. Hooker

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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