A free-text retrieval system using hash codes

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Abstract
An algorithm is presented for efficient serial searching of files whose records have arbitrary length free-text retrieval keys. It is most applicable when a batch of enquiries is to search a given file once only, which is an implicit feature of the SDI application for which it was designed. Unlike some other serial systems, an arbitrary number of enquiries can be handled with a single pass of the search file, and the algorithm is simple in concept, and straightforward to implement. Specimen performance figures are quoted in the appendix.

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