 Complete the following phrase:  By early 1942 the Japanese had assembled a force of nearly 130 aircraft in the islands to the north-west of Darwin. This force, comprising sixty-three Mitsubishi G4M Betty bombers, forty-eight Mitsubishi A6M Zero fighters, and eighteen four-engined flying boats, had been assembled from elements of the 21st and 23rd Air Flotillas which had already participated in the 