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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)

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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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1/1/2008 - 12/31/2008
USD ($)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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 -Name Regulation S-X (SX)
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 -Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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 -Name Accounting Research Bulletin (ARB)
 -Number 51
 -Paragraph 38
 -Subparagraph c(3)

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
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