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how to write a source code that does not depend on the execution environment
key consisting of a lever that sends a telegraph signal when it is depressed and the circuit is closed
compilers must parse source code in order to translate it into object code
converting from one code to another
computerizing coding system called {EBCDIc code}
It can cruise along a programmed route without remote operation.
a secret number that exchanges a character line by using the same key, called a block number
a switch that can be activated by remote control
he went ahead disobediently and did what his supervisor had warned him not to do