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This paper describes an information system SIGMA implemented on the computer at our University Computer Center. The system creates, for each user, a MEMO space for his private notebook and SIGMA space...s for sharing data with other users. The system assumes, as data structure, only the strings of characters, and hence the main access method is a linear search. We developed a general purpose linear search method called one-way sequential search which extensively makes use of pattern matching machines. Communications between users and the system are automatically recorded in log files, which function as command procedures.show more
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