Combining Texts

You have chosen 'The Identity of Indiscernibles' by Max Black, 'Preface to 'Principles of Philosophy'' by Ren Descartes and 'What is Cantor's Continuum Problem?' by Kurt Gdel

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All the ideas for Knowledge Aims, or select a subheading:
      A. Knowledge
      B. Certain Knowledge
      C. Knowing Reality