Mrs. Bento found something unusual in the letter she received today. It came in as a brown 6"x9" envelope, which was clearly addressing to her. She cut open the envelope with a pair of scissors and several postcards dropped out. "Greetings from chilly Canada/This morning I went up the CN Tower/It is chilly in Toronto...all the names of the addressees are different. Indeed the front of two postcards are images of the CN Tower, taken from two different angles, the third one an aerial shot of the City, with the City Hall as the main focal point. Mrs. Bento doubted she had read something personal and she must have received something she was not supposed to. Then she found the Christmas card with a letter inside.
As she read the letter, she found out it was actually from one of the guests she received in September. Anna, the sender of the letter and postcards, explained how she found the unsent postcards in her suitcase after three months traveling. She would appreciate the help of Mrs. Bento to send them out. In thanking her, Anna sent her the Christmas card - a graphically beautiful card of the Windy City, with an helicopter hovering above skyscrapers, carrying a Christmas tree of at least thirteen stories high.
Mrs. Bento was relieved. At least she had not opened a letter belonging to someone else, or peeped into something private. Now, the question is, which Annas sent the letter? She had at least three Annas in her database. She turned on her old PowerBook and started emailing.
