Combining Texts

You have chosen 'The Tenseless Theory of Time' by J.J.C. Smart, 'Morality and Human Sexuality' by Vincent C. Punzo and 'Principles of Arithmetic, by a new method' by Giuseppe Peano

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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