| 摘要 |
Methods and apparatus are provided through which, after insertion of a card into a card reader, a code word is presented which is made up of a certain number of signs or symbols. The user uses a pushbutton or other control to make selections of signs associated with the code word. If the correct signs are selected, an output is developed for control of an appropriate control function. The signs may be presented serially, in parallel or with a combination of serial and parallel presentations. Various means may be used for presentation of the code word and signs.
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