 Complete the following phrase:  Up to the end of March 1945 there had been a total of 314 air raids on Berlin, with 85 of those coming in the last twelve months Half of all houses were damaged and around a third uninhabitable, as much as 16 km2 of the city was simply rubble. Estimates of the total number of dead in Berlin from air raids range from 20,000 to 50,000; current German studies suggest that a figure in the lower part of this range is more likely. This compares to death tolls of between 25,000 and 35,000 in the single attack on 