A fuzzy matching between the elements is performed by using the preprogrammed
fuzzy matching routines. The following set operators are used for the fuzzy set operations:
y& yU yD y\ y*& y*U y*D y*\ Fuzzy matching is settable with Levenshtein distance using the
fuzzy command. The Levenshtein distance is a string metric for measuring the difference between two sequences and ASPL fuzzy operators are programmed to to do set operations when the name of the elements vary in one or more characters.
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