| 1 | Introduction | .... 2 |
| 2 | Unfold/fold Transformation | .... 3 |
| 3 | Preservation of the Well-Founded Semantics | .... 5 |
| 4 | Preservation of the Model Semantics | .... 7 |
| 5 | Concluding Remarks | .... 9 |
| Acknowledgements | .... 10 | |
| References | .... 11 | |
| End | .... 12 |
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