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                   So, to place a hold on all deliveries to customers with delinquent 
                    accounts, the accounting environment catalog (ACCTEC) would 
                    be searched first, for all customers who are three months 
                    in arrears.  
                  Then the order entry environment catalog (CUSTEC) would be 
                    searched for customer rows using the account numbers qualified 
                    in the ACCTEC environment. 
                    
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