 Complete the following phrase:  Work on an operational level was carried out jointly by the USA section of OKHChi and NAAS 5 at St. Germain. Early in 1944, NAAS 4 had been supplied with a group of cryptanalysts skilled in work on the M-209, and this small group competed with the section at In 7VI in the quick solution of M-209 traffic. It estimated that 10-20 of all M-209 messages intercepted were read by establishing the true settings of the wheels, and that about half of these settings were established at OKHChi, half at NAAS 5. To insure speedy solution all subordinated to KONA 5 were ordered to teleprint to NAAS 5 all messages on the same settings or with Indicators differing only in the first two letters. Under the most favourable circumstances two days were needed to solve a depth, and two more days to reconstruct the absolute settings. There were times, however, when captured lists of keys or settings made possible a quick solution of the traffic. During the Allied invasion of Sicily and the 