| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Layered Structure of the Knowledge Base | .... 4 |
| 3 | Description of Structured Knowledge | .... 7 |
| 4 | Constructing Abstractive Layers | .... 11 |
| 5 | Retrieval Using Structured Knowledge | .... 13 |
| 6 | Conclusion | .... 15 |
| Acknowledgement | .... 15 | |
| References | .... 16 | |
| End | .... 21 |
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