For low error levels, the fastest known algorithm … [for approximate string matching] … is the filtration algorithm, i.e., it quickly discards … algorithm. … it ceases to work well for moderate error … [ref]. We also improve the filter on biased texts such as … [p. 70] On English text we add … Agrep [ref] (the fastest known approximate search software) … although Agrep is normally faster than [our original algorithm], we are faster than Agrep with the hierarchical verification, and …
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