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(AP) — This undated image provided by Hellman's shows an undated advertisement for Hellmann's mayonnaise.

Hellman's turns 100 in 2013 and to celebrate the anniversary, owner Unilever Food is launching a marketing campaign including a Facebook page and YouTube videos featuring chef Mario Batali cooking up his favorite Hellman's recipes, a smartphone app and a June event featuring the world's largest picnic table. (AP Photo/Hellman's)

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