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Time moves on. You can't go back in time. Everything has a consequence, and the last episode of the last season is no exception.

"John Hamm on SHREK FOREVER AFTER and MAD MEN Season 4". Interview with Steve 'Frosty' Weintraub, collider.com. May 18, 2010.
Time moves on. You can't go back in time. Everything has a consequence, and the last episode of the last season is no exception.