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Answer:
CODES
Possible Questions:
Rules
Secret stuff
Things to crack
Secret writings
Ciphers
They may be cracked
Secret messages
Programs
They're sometimes cracked
Area and zip
Morse and others
Cryptography topic
Cryptographers' creations
Works on a program
Things broken by the C.I.A.
Systems of signals
Systems of rules
Some are made of bars
Sets of regulations
Sets of principles
Secret languages
Secret communications
Regulations for builders
Protocols
Programmers' output
Prepares punch cards
Penal and Napoleonic
Morse et al.
Morse and zip, e.g.
Morse and zip
Morse and area
Message systems
Legacies of Morse and Hammurabi
Kin of ciphers
Hides the meaning
Features of secret messages
Encrypts
Encryptions
Does some computer programming
Disguises the meaning
Cryptography topics
Cryptographer's study
Cryptographer's creations
Crackers may be used on them
Computer programmers' expertise
Buildings often have them
"One if by land, two if by sea" and others