Sarah Rodman’s notes on Sunday’s TV offerings including “SEAL Team Six: The Raid on Osama Bin Laden” at 8 p.m. on National Geographic; “The Walking Dead” at 9 p.m. on AMC; “The Amazing Race” at 8:30 p.m. on Channel 4; “Treme” at 10 p.m. on HBO; and “The Next Iron Chef: Redemption” at 9 p.m. on the Food Network.
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