You have chosen 'On Plural Reference and Set Theory' by Helen Cartwright, 'Must We Believe in Set Theory?' by George Boolos and 'A Priori Knowledge Revisited' by Philip Kitcher
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |