| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Unfold/Fold Transformation | .... 3 |
| 3 | Unfold/Fold Transformation of Stratified Programs | .... 9 |
| 4 | On Preservation of Perfect Model Smantics | .... 12 |
| 5 | Conclusion | .... 12 |
| 6 | Acknowledgement | .... 13 |
| 7 | References | .... 13 |
| End | .... 14 |
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