You have chosen 'Gentzen's Analysis of First-Order Proofs' by Dag Prawitz, 'On Liberty' by John Stuart Mill and 'The Concept of a Person' by A.J. Ayer
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |