In this Monday, April 25, 2011, photo, 3M's Post-it notes are on sale at Office Depot in Mountain View, Calif. Post-it notes and other office products helped lift 3M's fourth-quarter profit in 2012, despite a slowdown in other parts of its business. (AP Photo/Paul Sakuma)

Associated Press
In this Monday, April 25, 2011, photo, 3M's Post-it notes are  on sale at Office Depot in Mountain View, Calif. Post-it notes and other office products helped lift 3M's fourth-quarter profit in 2012, despite a slowdown in other parts of its business. (AP Photo/Paul Sakuma)
In this Monday, April 25, 2011, photo, 3M's Post-it notes are on sale at Office Depot in Mountain View, Calif. Post-it notes and other office products helped lift 3M's fourth-quarter profit in 2012, despite a slowdown in other parts of its business. (AP Photo/Paul Sakuma)
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