Net income includes purchased research and development expenses of $471 million, $594 million, and $508 million in 1999, 1998, and 1997,respectively, as well as realized gains on the sale of a minority stock investment of $5 million in 1998 and $152 million in 1997. On a pro forma basis, return on average equity, excluding these nonrecurring items net of tax, would have been 24.1%, 29.3% and 37.1% for 1999, 1998 and 1997, respectively.

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