 | us-gaap:OtherCostAndExpenseDisclosureOperating | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:BusinessDevelopment | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:FloorBrokerage | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:MarketingExpense | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:OrderFlowFees | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
 | us-gaap:OtherCostAndExpenseOperating | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:OtherNonrecurringExpense | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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 | us-gaap:PostageExpense | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
 | us-gaap:PreOpeningCosts | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
 | us-gaap:ProductionAndDistributionCosts | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |
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