RED
... that a major weakness of the Japanese RED cipher arose from the desire to save money on telegrams?
... that a major weakness of the Japanese <b id="mwFoA"><a class="mw-redirect" href="./Red_(cipher_machine)" id="mwFoE" rel="mw:WikiLink" title="Red (cipher machine)">RED</a></b> <a href="./Cipher" id="mwFoI" rel="mw:WikiLink" title="Cipher">cipher</a> arose from the desire to save money on <a class="mw-redirect" href="./Telegram" id="mwFoM" rel="mw:WikiLink" title="Telegram">telegrams</a>?