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'Mama' screams to top of N. America box office

L-R: Actresses Megan Charpentier, Isabelle Nelisse and Jessica Chastain attend the "Mama" screening at Landmark's Sunshine Cinema in New York on January 7, 2013. "Mama" pushed the Oscar-tipped bin Laden manhunt movie "Zero Dark Thirty" out of the top slotNewly released horror film "Mama" pushed the Oscar-tipped bin Laden manhunt movie "Zero Dark Thirty" out of the top slot at the North American weekend box office, industry estimates showed Sunday.