Combining Texts

You have chosen 'Believing the Axioms I' by Penelope Maddy, 'On 'Generation and Corruption'' by Albertus Magnus and 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess

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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