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Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Billings in excess of services provided Increase Decrease in Billing in Excess of Service Provided Net change during the period in billings in excess of services provided. 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