You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Nominalism and Substitutional Quantifiers' by Ruth Barcan Marcus and 'Some Main Problems of Philosophy' by G.E. Moore
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |