Combining Texts

You have chosen 'Preface to 'Principles of Philosophy'' by René Descartes, 'Presentation of Self in Everyday Life' by Erving Goffman and 'There is immediate Justification' by James Pryor

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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