Input (grade 13): Together with his friend Christian Gaudian, Gueffroy attempted on the night of February 5 & ndash; 6, 1989, to escape from East Berlin to West Berlin, along the Britz district canal.
Output (grade 11): Gueffroy and his friend Christian Gaudian tried to escape from East Berlin to West Berlin on the night of February 5 to February 6, 1989.