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End-of-Sale and End-of-Life Announcement for the Cisco IOS XE Software 3.7.xE for Cisco Catalyst 4500-E/X Series Switches and Cisco IOS 15.2(3)E for Cisco Catalyst 2960-X/XR, 2960-Plus, 2960 C/CX, 3750-X, 3560-X/CX, and 4900 Series Switches