 Nyorai kupfuurira kweiyi ndima - Muna January 1944, Mainline Codes dzeJapan Army dzakatyorwa nebetsero kubva pachigadziko chakavigwa chakawanikwa panguva yeHondo yeSiomuNew Guinea namauto eAustralia eDivision yechi9. Zvinyorwa zvacho zvakanga zvasiyiwa nemauto echiuto echiJapan akanga achidzokera shure e20th Division Tokyo yakanga yaudzwa kuti mapepa akanga apiswa, asi lieutenant akanga asingadi kuzivisa nzvimbo yake nokuapisa, naizvozvo zvakavigwa mubhokisi resimbi pedyo norukova. Izvo zvaisanganisira bhuku remitemo rehondo Rikugun Angosho Nhamba Yechina iyo yakaiswa mumashini aSinkovs IBM; mabhuku maviri ekuwedzera uye makodhi eaya mazita ekufambisa ayo zvino aigona kuverengwa: 2345, 5555, 6666, 7777 uye 7870; uye bhuku remirayiridzo yekuti ungashandisa sei mamwe mabhuku. Central Bureau yakapedza zuva rose ichiomesa mapeji ane unyoro, uye mafashamo emashoko akatsanangurwa ayo akatevera akareva kuti MacArthur aifanira kukumbira US Navy nokuda kwebetsero. Vashanduri vaviri, Forrest Biard naThomas Mackie vakatumwa vachibva kuFRUMEL. 