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The Computer Journal 1977 20(2):141-147; doi:10.1093/comjnl/20.2.141
© 1977 by British Computer Society
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A binary n-gram technique for automatic correction of substitution, deletion, insertion and reversal errors in words

J. R. Ullmann *

Department of Applied Mathematics and Computing Science, The University, Sheffield, UK

An n-gram is and n-character subset of a word. Techniques that are already well known use n-grams for detecting and correcting spelling errors in words. This paper offers three basic contributions to n-grams technology. First, a method of reducing storage requirements by random superimposed coding. Second, an n-gram method for finding all dictionary words that differ from a give word by up to two errors. Third, an n-gram method for correcting up to two substitution, insertion, deletion and reversal errors without doing a separate computation for every possible pair of errors.

Received November 1975.

* Now at: Department of Applied Mathematics and Computing Science, The University, Sheffield S10 2TN.

§ Division of Computer Science, National Physical Laboratory, Teddington, Middlesex, TW11 0LW


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