Combining Texts

You have chosen 'To be is to be the value of a variable..' by George Boolos, 'Thinking About Logic' by Stephen Read and 'Structure and Nature' by Willard Quine

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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