Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'On the General Idea of Proof Theory' by Dag Prawitz and 'On the Conservation of Force' by Hermann von Helmholtz

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All the ideas for Nature of Minds, or select a subheading:
      A. Nature of Mind
      B. Features of Minds
      C. Capacities of Minds