Combining Texts

You have chosen 'Against Coherence' by Erik J. Olsson, 'The Right and the Good' by W. David Ross and 'Which Logic is the Right Logic?' by Leslie H. Tharp

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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