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| 0001628280-22-004368.txt | 2022-03-01 08:31:00 | |
 0001628280-22-004368-xbrl.zip | 31567 | 2022-03-01 08:31:00 |
| FilingSummary.xml | 1749 | 2022-03-01 08:31:00 |
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| R1.htm | 38609 | 2022-03-01 08:31:00 |
| regi-2021q4erxex991.htm | 391362 | 2022-03-01 08:31:00 |
| regi-20220301.htm | 35254 | 2022-03-01 08:31:00 |
| regi-20220301.xsd | 1996 | 2022-03-01 08:31:00 |
| regi-20220301_htm.xml | 11083 | 2022-03-01 08:31:00 |
| regi-20220301_lab.xml | 24137 | 2022-03-01 08:31:00 |
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