Combining Texts

You have chosen 'Individuals without Sortals' by M.R. Ayers, 'First-order Logic, 2nd-order, Completeness' by Marcus Rossberg and 'Essays on Intellectual Powers 3: Memory' by Thomas Reid

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge