polyalphabetically
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polyalphabetically — poly·alphabetically … English syllables
polyalphabetically — adverb see polyalphabetic … Useful english dictionary
Japanese cryptology from the 1500s to Meiji — The cipher system that Uesugi used is basically a simple substitution usually known as a Polybius square or “checkerboard.” The i ro ha alphabet contains forty eight letters, so a seven by seven square is used, with one of the cells left blank.… … Wikipedia
