You have chosen 'An Argument for the Identity Theory' by David Lewis, 'Letters to Burcher De Volder' by Gottfried Leibniz and 'A Combinatorial Theory of Possibility' by David M. Armstrong
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |