Statement

Giorgio has always been a fan of encyclopedias. Among his vast collection, some of the rarest encyclopedias in existence can be found. The most famous encyclopedia to ever be printed is probably the eleventh edition of the Encyclopaedia Britannica. Obviously, Giorgio owns all 29 volumes of it: Giorgio has decided to create his own new encyclopedia. Instead of words, this "Olympic Encyclopaedia" will use the names of the tasks given during the previous editions of the Italian Olympiads in Informatics. The "definition" of each term will actually be a detailed tutorial for solving the corresponding task. For example, in the entry for "poldo", Giorgio will write a detailed tutorial for solving the "La dieta di Poldo" task from the regional selection 2004 of the Olympiads. The spine of each volume contains an indication of which words can be found on the inside...