You have chosen 'Reply to Foucher' by Gottfried Leibniz, 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen and 'Critique of the Gotha Program' by Karl Marx
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |