rtokens: KeyCorp , contacted by phone , would not comment .
pos: NNS IN NNP NNP , NNP , NNP CD CC NNP NNP VBD DT NNS VBP RB VB IN NNS IN JJ NNS CC NNS .
tokens: Representatives of First Bank , Norwest , Banc One and First Chicago said the banks do not comment on rumors of possible mergers or acquisitions .
ltokens: 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 .