of frustration for the letter writers who receive their mail back stamped: ???Return to sender.???However, for Weng Cheng-hsien (?????????), such letters are seen as a challenge to his skills in completing the delivery.In October, a letter from Japan was to test his skills.The letter was addressed to a Ms Chang Mei-yueh (?????????), at No. 33 Singnan Borough (??????), Huwei Town.However, at the ad