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BUSINESS COMBINATIONS AND RELATED ACTIVITY (Details - Assets and Liabilities Assumed) $ in Thousands | Nov. 01, 2022 USD ($) loan shares | Aug. 24, 2021 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 09, 2022 USD ($) | Dec. 01, 2022 USD ($) | Oct. 01, 2022 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 06, 2021 USD ($) | Dec. 01, 2021 USD ($) | Jun. 01, 2021 USD ($) | May 01, 2021 USD ($) | Apr. 01, 2021 USD ($) | Mar. 01, 2021 USD ($) | Feb. 01, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 677,665 |  |  |  |  | $ 513,820 |  |  |  |  |  |  |  | $ 472,879
I F R C L L C Subsidiary One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  | $ 8,200 |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  | 2,910 |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  | 1,703 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 5,271 |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  | (1,703) |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
I F R C L L C Subsidiary Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  | 4,800 |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  | 2,103 |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  | 857 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2,697 |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  | (857) |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Montclair Radiological Associates, P.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  | $ 94,877 |  |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  | 16,414 |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  | 4,665 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 79,690 |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  | (2,168) |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  | (4,124) |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Heart and Lung Imaging Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration | $ 32,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property & Equipment | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 16,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued | $ 10,800 |  | 11,656 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 359,002 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 15,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chelsea Dignostic Radiology, P.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  | $ 2,800 |  |  |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  | 568 |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 2,132 |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
North Jersey Imaging Center, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  | $ 104 |  |  |  |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 55 |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
I F R C L L C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries acquired | loan | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
I F R C L L C | Joint Venture With Calvert Medical Imaging Centers LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries acquired | loan | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Personal Health Imaging PLLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,995 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 576 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 608 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,355 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (608) |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
ZP Elmont LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,194 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,112 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,005 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
ZP Freeport LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,065 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,668 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,328 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |
Broadway Medical Imaging LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,155 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,076 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 446 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (446) |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |
3235 Hempstead LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,386 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,667 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,649 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |
SLZM Realty LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,671 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,617 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,974 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80 |
2012 Sunrise Merrick LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,428 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,741 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 335 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,617 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (335) |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70 |
ZP Bayside LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,545 |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,385 |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,191 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,191) |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |
ZP Laurelton LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,658 |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,530 |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,418 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 46 |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,418) |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |
ZP Smith LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,978 |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,581 |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,214 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 347 |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,214) |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |
ZP 907 Northern LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 562 |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  | 507 |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  | 1,817 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (1,817) |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |
William M. Kelly MD, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  | 2,346 | $ 4,404 |  |  | $ 3,750 |  |  |  |
Property & Equipment |  |  |  |  |  |  |  | 99 | 701 |  |  | 990 |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  | 323 | 0 |  |  | 1,379 |  |  |  |
Goodwill |  |  |  |  |  |  |  | 2,197 | 3,653 |  |  | 2,710 |  |  |  |
Other |  |  |  |  |  |  |  | 0 | 0 |  |  | 0 |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  | (323) | 0 |  |  | (1,379) |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 50 | $ 50 |  |  | 50 |  |  |  |
60th Street MRI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  | 85 |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 290 |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |
ZP Parkchester LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  |  | 263 |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  | 213 |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  | 311 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  | (311) |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |
ZP Eastern LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  |  | $ 2,868 |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  | 2,801 |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  | 1,951 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  | (1,951) |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |
Tangent Associates LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  | $ 2,025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property & Equipment |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 379 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 67,658,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 1,636 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid Delaware Imaging P.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  |  |  |  |  |  |  |  | $ 6,023 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  | 590 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 5,260 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Purchase Consideration |  |  | 142,781 |  |  |  |  | 79,716 |  |  |  |  |  |  |  |
Property & Equipment |  |  | 22,015 |  |  |  |  | 35,949 |  |  |  |  |  |  |  |
Right of Use Assets |  |  | 7,225 |  |  |  |  | 12,993 |  |  |  |  |  |  |  |
Goodwill |  |  | 106,045 |  |  |  |  | 40,864 |  |  |  |  |  |  |  |
Other |  |  | (2,145) |  |  |  |  | 232 |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  | (6,684) |  |  |  |  | (12,993) |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 16,325 |  |  |  |  | $ 2,671 |  |  |  |  |  |  |  |

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