rtokens: Representatives of First Bank , Norwest , Banc One and First Chicago said the banks do not comment on rumors of possible mergers or acquisitions .
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tokens: Among those seen as having an interest in buying in Missouri are Minneapolis-based First Bank System Inc. and Norwest Corp. , Ohio-based KeyCorp and Banc One Corp. , and First Chicago NBD Corp. in Illinois .
ltokens: Mercantile and Commerce did not return phone calls seeking comment .