Combining Texts

You have chosen 'Intro to 'Philosophy of Logic'' by Dale Jacquette, 'The Philosophy of Leibniz' by Bertrand Russell and 'Morality and Human Sexuality' by Vincent C. Punzo

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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