CHICAGO - Though Bank One Corp. is not slated to reveal its second-quarter results for another three weeks and has been tight-lipped about its planned restructuring, analysts say it could take a second-quarter charge of $1 billion to $2 billion as it cleans up problems in several major businesses.

Those charges are tied to a series of expected writedowns involving some of Bank One's core businesses, including its troubled First USA credit card unit and its Internet venture, WingspanBank.com, according to industry observers.

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