TheCodeBreakers
were written under this keynumber from right to left and then copied out
in mixed order, taking first the letter under number 1, then the letter
under number 2, until the row was completed. The process was repeated
for successive rows.
For example, on December 4 Yoshikawa wired the Foreign Minister
that "At 1 o'clock on the 4th a light cruiser of the Honolulu class hastily
departed—Morimura." In romaji (the roman-letter version of the kata
kana) this became 4th gogo 1 kei jun (honoruru) kata hyaku shutsu ko—
morimura. In PA, with the parentheses getting their own codegroups (OQ
and UQ), it assumed this form: BYDH DOST JE YO IA OQ GU RA HY HY UQ VI LA YJ
AY EC TY FI BANL, with FI indicating use four-letter code. (The code clerk
made two errors. After encoding kata by VI, he encoded an extra ta into
LA and an unnecessary re into TY.) This was then written under the
keynumber from right to left, with an extra letter I as a null to complete
the final five-letter group:
annaabi.ee 
