BERLIN (AP).- A rare sheet of 10 stamps depicting Audrey Hepburn fetched euro430,000 ($606,000) at a charity auction in Berlin on Saturday, two-thirds of which will go to help educate children in sub-Saharan Africa. The mint-condition sheet of 10 stamps featuring Hepburn, a coy smile on her face and a long, black cigarette holder dangling from her lips, brought a profitable outcome to a botched stamp series that should have been destroyed years ago — and evokes Hepburn’s starring role in the 1963 thriller “Charade,” in which the characters chase a set of rare stamps. Sean Ferrer, 50, Hepburn’s son with actor and director Mel Ferrer, and the chair of the Audrey Hepburn Children’s Fund, said he was thrilled that the sale Saturday brought “focus on children in need,” but