Hello! I sneaked into the pages of this book –uninvited, of course– because I like crosswords and quizzes, on the condition that they don't include... cats. The exercises were created while playing by Leonidas, Margarita, Vangelis, and Angela, the quadruplets of Mr. Giannis and Mrs. Nelli, who finished the 4th grade. Now, how all this fit into one book is a story you will learn by leafing through it.