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a transmission that will trigger an answering transmission from a transponder
a feedback circuit that subtracts from the input
how to write a source code that does not depend on the execution environment
the CATV by using which an addressee is capable of communicating with a broadcasting station
a special delivery telegram that informs the receiver that the sender is waiting for an answer at the exchange
a mysterious document whose origin is unknown
a message whose content is at variance with reason
a miscalculation that recoils on its maker
a request which is impossible to be fulfilled