Input (grade 12): From 1966 to 1975 the Gropiusstadt was built, a "Trabantenstadt" or city-within-a-city housing estate, designed by architect Walter Gropius.
Output (grade 6): Between 1966 and 1975, the "Gropiusstadt" was built. This city-within-a-city was designed by architect Walter Gropius.