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An identifying paragraph included in letters to some Chicago-area Comerica Bank customers provides a glimpse into some of the confusion bank mergers can cause.

”Comerica Bank-Illinois, formerly known as Manufacturers Affiliated Trust Company, successor trustee to Affiliated Bank/West National, formerly known as Western Bank of Cicero,” says a document from the former Affiliated`s trust department.

The lengthy identification has a number of longtime customers scratching their heads, according to one Comerica-formerly Affiliated-employee.

”We are getting calls from people asking, `Just who should I make the check out to?”` she said.