 Complete the following phrase:  Not much material concerning other British low-grade systems solved was found by TICOM. Hentze of KONA 5 stated that Maplay code was worked on throughout 1944, but this code was harder to break than Slidex, and were successful only with a great deal of traffic. Codex was solved by OKHChi largely with the help of a captured specimen which had been in the possession of Germany since the days of the 