v2.4.0.6

Debt (Details Textual) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  | 1 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |
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Jun. 30, 2011 USD ($) | Jun. 01, 2010 USD ($) | May 31, 2008 USD ($) | Nov. 30, 2007 USD ($) | Dec. 31, 2010 USD ($) Property | Dec. 31, 2011 USD ($) Y Loans Notes Property | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 USD ($) Property | Dec. 31, 2009 USD ($) | Dec. 31, 2011 JPY (¥) | Nov. 24, 2011 USD ($) | Nov. 24, 2011 JPY (¥) | Jun. 03, 2011 USD ($) | Jun. 03, 2011 JPY (¥) | Oct. 31, 2009 USD ($) | Mar. 31, 2007 USD ($) | Dec. 31, 2011 Euro [Member] USD ($) | Dec. 31, 2011 Japanese yen [Member] USD ($) | Dec. 31, 2011 British sterling pound [Member] USD ($) | Dec. 31, 2011 Singapore Dollars [Member] USD ($) | Dec. 31, 2011 Properties fund eight [Member] | Mar. 15, 2010 3.25% convertible senior notes maturing in 2015 [Member] | Mar. 31, 2010 TMK bonds at 4.09% [Member] | Dec. 31, 2011 TMK bonds due March 2018 at 1.34% [Member] Bonds Property | Mar. 31, 2010 Convertible Note 2010 [Member] USD ($) | Mar. 31, 2007 Convertible Note in 2007 and 2008 [Member] USD ($) | Dec. 31, 2011 Convertible Debt [Member] Maximum [Member] | Dec. 31, 2011 Convertible Debt [Member] Minimum [Member] | Dec. 31, 2011 Other debt of consolidated investees [Member] Maximum [Member] | Dec. 31, 2011 Other debt of consolidated investees [Member] Minimum [Member] | Dec. 31, 2011 Consolidated Investees [Member] USD ($) | Jun. 30, 2011 Consolidated Investees [Member] USD ($) | Dec. 31, 2011 Secured mortgage debt [Member] USD ($) | Dec. 15, 2011 Secured mortgage debt [Member] USD ($) Property | Dec. 31, 2011 Secured mortgage debt [Member] Maximum [Member] | Dec. 31, 2011 Secured mortgage debt [Member] Minimum [Member] | Dec. 31, 2011 Secured mortgage debt [Member] April 2012 to May 2025 [Member] Maximum [Member] | Dec. 31, 2011 Secured mortgage debt [Member] April 2012 to May 2025 [Member] Minimum [Member] | Dec. 31, 2011 Other debt [Member] USD ($) | Dec. 15, 2011 Secured mortgage debt of consolidated investees [Member] USD ($) | Dec. 15, 2011 Secured mortgage debt of consolidated investees [Member] Secured mortgage debt due 2016 [Member] USD ($) | Dec. 15, 2011 Secured mortgage debt of consolidated investees [Member] Secured mortgage debt due december 2018 [Member] USD ($) | Dec. 31, 2011 Notes payable other payables [Member] Maximum [Member] | Dec. 31, 2011 Notes payable other payables [Member] Minimum [Member]
Senior And Other Notes Convertible Notes And Secured Mortgage Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties secured by debt |  |  |  |  |  | 12 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% | 4.09% |  |  |  | 5.86% | 3.25% | 5.88% | 2.41% |  |  |  |  | 7.58% | 1.37% | 7.58% | 1.73% |  |  | 4.58% | 5.04% | 9.34% | 3.25%
Base principal amount per note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of TMK bonds with merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of exchangeable notes |  |  | $ 170.74 | $ 182.24 |  |  |  |  |  |  |  |  |  |  |  | $ 170.21 |  |  |  |  |  |  |  |  | $ 38.72 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  | 38,700,000 | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 460,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate of notes to shares of common stock |  |  | 5.8564 | 5.4874 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.8244 | 5.8752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average annual interest rate of secured mortgage debt |  |  |  |  | 5.79% | 5.12% | 5.12% | 5.79% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Payment of mortgage notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  | 985 | 1,797 | 1,797 | 985 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |  |
Minimum interest rates |  |  |  |  |  | 1.875% | 1.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Maximum interest rates |  |  |  |  |  | 8.70% | 8.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Aggregate unpredictable cost of properties |  |  |  |  |  |  |  |  |  |  | 147,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 320,700,000 |  |  |  |  | 793,300,000 |  |  |  |  |
Secured mortgage debt incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 177,000,000 | 103,000,000 | 74,000,000 |  |
Secured debt acquired in the merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 211,300,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of partners interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available borrowing line |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,400,000 | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
All Currencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign principal borrowing included in total debt |  |  |  |  |  | 3,950,000,000 |  |  |  |  |  |  |  |  |  |  | 2,090,000,000 | 1,410,000,000 | 430,000,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of ownership required in consolidated subsidiaries to provide guarantee to debt issued |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average coupon interest rate |  |  |  |  | 2.60% | 2.60% | 2.60% | 2.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes aquired in the merger |  |  |  |  |  | 1,710,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Count of properties securing mortgage debt |  |  |  |  |  | 219 | 219 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of properties securing mortgage debt |  |  |  |  |  | 4,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Count of properties securing consolidated investees mortgage debt |  |  |  |  |  | 231 | 231 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of properties securing consolidated investees mortgage debt |  |  |  |  |  | 3,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated investee credit facility included in debt |  |  |  |  |  | 54,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eurobond amount included in debt |  |  |  |  |  | 559,100,000 | 427,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit facilities included in debt |  |  |  |  |  | 162,100,000 | 123,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of Eurobonds |  |  |  |  |  | 118,600,000 | 86,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from Repurchase of Eurobonds |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment bonds included in other debt |  |  |  |  |  | 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate term loans included in other debt |  |  |  |  |  | 368,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Global credit facility borrowing limit |  |  |  |  |  |  |  |  |  |  |  |  | 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future global credit facility borrowing limit |  |  |  |  |  |  |  |  |  |  |  |  | 2,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross acceleration included in defaults |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt revolver borrowing amount |  |  |  |  |  | 471,300,000 |  |  |  |  |  |  |  | 36,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future debt revolver borrowing amount |  |  |  |  |  | 729,600,000 |  |  |  |  |  |  |  | 56,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of exchange offer | 4,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of exchange offer validly tendered for exchange | 4,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of exchange offer validly tendered for exchange | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative instruments |  |  |  |  |  | 62,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Derivative |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange gain loss |  |  |  |  |  | 44,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undepreciated value of properties securing bonds |  |  |  |  |  | 271,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds acquired in merger |  |  |  |  |  | 23,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes acquired in merger |  |  |  |  |  | 174,300,000 |  |  |  | 13,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undepreciated value of properties securing debt acquired in merger |  |  |  |  |  | 48,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign term loan balance |  |  |  |  |  | 161,300,000 |  |  |  | 12,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate of foreign term loan |  |  |  |  |  | 3.40% | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured term loan balance |  |  |  |  |  | 201,000,000 | 154,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate of senior unsecured term loan |  |  |  |  |  | 3.40% | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit facilities included in maturities |  |  |  |  |  | 215,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured mortgage debt |  |  |  |  |  | 145,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of secured mortgage notes with merger |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price beyond which shares required to include in the computation of diluted earnings per share |  |  | $ 140.82 | $ 153.07 |  |  |  |  |  |  |  |  |  |  |  | $ 142.97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount on debt |  |  |  |  | 59,300,000 | (60,000) |  | 59,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid in capital under conversion option |  |  |  |  |  | 381,500,000 |  | 381,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity dates starts |  |  |  |  |  | 2012 | 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity dates ends |  |  |  |  |  | 2033 | 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of capitalized interest |  |  |  |  |  | 88,000,000 |  | 381,800,000 | 290,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable Senior Notes Outstanding |  |  |  |  |  | 6,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Outstanding |  |  |  |  |  | 6,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to record holder |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
principal amount of solicited notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solicited Notes Fees And Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced size of the aggregate commitments |  | 2,250,000,000 |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate represented premium |  |  |  |  |  | 20% over the closing price of common stock | 20% over the closing price of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of closing price of common stock, represented premium |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate borrowing capacity |  |  |  |  | 1,601,500,000 | 2,184,600,000 | 487,500,000 | 1,601,500,000 | 2,164,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding term loans |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased borrowing limit |  |  |  |  |  | 987,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payment period of consolidated debt |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Debt | 12.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from the contribution or sale of properties | 1,000,000,000 |  |  |  | 1,020,000,000 | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available in capital contribution |  |  |  |  |  | 157,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share in capital contribution |  |  |  |  |  | $ 92,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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