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<us-gaap:InvestmentOwnedUnderlyingFaceAmountAtMarketValue contextRef="Context_As_Of_30-Sep-2012_AreaAxis_U.SMember_MajorTypesOfDebtAndEquitySecuritiesAxis_CommercialPaperMember_InvestmentSubcategoryAxis_DiversifiedFinancialServicesMember_InvestmentTypeAxis_ZeroPointOneNinePercentRiverFuelFundingCompany3Inc.MaturingAt31October2012Member" unitRef="USD" decimals="0">250000</us-gaap:InvestmentOwnedUnderlyingFaceAmountAtMarketValue>
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