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 alter table account add foreign key (branchName) references branch(branchName);
 alter table depositor add foreign key (accountNumber) references account(accountNumber);
 alter table depositor add foreign key (customerName) references customer(customerName);
 alter table borrower add foreign key (customerName) references customer(customerName);
 alter table borrower add foreign key (loanNumber) references loan(loanNumber);
 alter table loan add foreign key (branchName) references branch(branchName);