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| ck0000811030-20230831.htm | 1336629 | 2023-12-19 16:29:06 |
| ck0000811030-20230831.xsd | 9981 | 2023-12-19 16:29:06 |
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| ck0000811030-20230831_htm.xml | 147403 | 2023-12-19 16:29:06 |
| ck0000811030-20230831_lab.xml | 257839 | 2023-12-19 16:29:06 |
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