TheCodeBreakers
whole classes of objects or kinds of messages. International chess games
by mail were stopped. Crossword puzzles were extracted from letters, for
the examiners did not have time to solve them to see if they concealed a
secret message, and so were newspaper clippings, which might have
spelled out messages by dotting successive letters with secret ink—a
modern version of a system described more than 2,000 years earlier by
Aeneas the Tactician. Listing of students' grades was tabooed. One letter
containing knitting instructions was held up long enough for an
examiner to knit a sweater to see if the given sequence of knit two and
cast off contained a hidden message like that of Madame Defarge, who
knitted into her "shrouds" the names of further enemies of the French
Republic, "whose lives the guillotine then surely swallowed up." A stamp
bank was maintained at each censorship station; examiners removed
annaabi.ee 
