You have chosen 'The Inference to the Best Explanation' by Gilbert Harman, 'Model Theory for Modal Logic I' by Kit Fine and 'Proof that every set can be well-ordered' by Ernst Zermelo
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |