. purchases of equity securities 2013 during 2010 , we repurchased 17556522 shares of our common stock at an average price of $ 75.51 . the following table presents common stock repurchases during each month for the fourth quarter of 2010 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares that may yet be purchased under the plan or program [b] .