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| 0000320575-21-000030-index.html | 2021-05-07 09:27:45 | |
| 0000320575-21-000030.txt | 2021-05-07 09:27:45 | |
 0000320575-21-000030-xbrl.zip | 302719 | 2021-05-07 09:27:45 |
| exhibit311-q12021.htm | 9230 | 2021-05-07 09:27:45 |
| exhibit312-q12021.htm | 9191 | 2021-05-07 09:27:45 |
| exhibit321-q12021.htm | 4670 | 2021-05-07 09:27:45 |
| exhibit322-q12021.htm | 4700 | 2021-05-07 09:27:45 |
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| Financial_Report.xlsx | 75726 | 2021-05-07 09:27:45 |
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| pes-20210331.htm | 1352874 | 2021-05-07 09:27:45 |
| pes-20210331.xsd | 62538 | 2021-05-07 09:27:45 |
| pes-20210331_cal.xml | 82509 | 2021-05-07 09:27:45 |
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| pes-20210331_htm.xml | 939814 | 2021-05-07 09:27:45 |
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| report.css | 2767 | 2021-05-07 09:27:45 |
| Show.js | 1085 | 2021-05-07 09:27:45 |