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| 0001266454-08-000347-index.html | 2008-06-12 15:49:13 | |
| 0001266454-08-000347.txt | 2008-06-12 15:49:13 | |
| sigma_10q-050308.htm | 1267602 | 2008-06-12 15:49:13 |
| sigma_ex3101.htm | 17993 | 2008-06-12 15:49:13 |
| sigma_ex3102.htm | 17648 | 2008-06-12 15:49:13 |
| sigma_ex3201.htm | 5961 | 2008-06-12 15:49:13 |
| sigma_ex3202.htm | 5616 | 2008-06-12 15:49:13 |