You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Letter to Shumacher' by Carl Friedrich Gauss and 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |