You have chosen 'The iterative conception of Set' by George Boolos, 'True Method in Philosophy and Theology' by Gottfried Leibniz and 'The Fixation of Belief' by Charles Sanders Peirce
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |