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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Series A Preferred Units |  |  |  |  |  |
Units outstanding (units) | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468 | 71,090,468
Series B Preferred Units |  |  |  |  |  |
Units outstanding (units) | 800,000 | 800,000 | 800,000 | 800,000 | 800,000 | 800,000
Common Units |  |  |  |  |  |
Units outstanding (units) | 697,939,946 | 702,668,178 | 704,991,540 | 717,371,576 | 722,055,847 | 722,380,416

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- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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