<prompt> Nyorai kupfuurira kweiyi ndima - Muna 1939, iye akaita nzendo dzinokosha kupinda muJN-25, kodhi yokushandisa yechikepe cheJapan inoshandiswa nokuda kwamashoko anokosha zvikurusa. Akabudirira kugadzirisa cipher chikamu che 5-num system iyo yakashandisa mapoka enhamba sevanotsiva mazwi nenhamba iyo yakawedzera kunyorwa nedhijitari. Pashure paikoko, Navy yaigona kurava mashoko omumutauro wenguva dzose, akadai semishumo yemamiriro okunze, asi chikamu chikuru chemashoko chakanga chisati chawanwa. Basa iri rakazogadziridzwa uye rakashandiswa pashure pokurwiswa kwePearl Harbor kwehondo yose yePacific uye rakapa nyevero yokutanga yokurwiswa kweJapan  <response>: paMidway Atoll. Haana kukwanisa kuita basa iri nokuti, muna October 1940, akaendeswa kuchikwata chaishanda kuti chivhure kodhi yeEnigma yemasoja eGermany. 