Rule schema Acronym description N1FT the tag of the first morpheme (FT) of the next eojeol (N1) P1LT the tag of the last morpheme (LT) of the previous eojeol (P1) N2FT the tag of the first morpheme (FT) of the eojeol after the next one (N2) N3FT the tag of the first morpheme (FT) of the second eojeol after the next one N3  of the statistical morpheme tagger.
designing the error correction rules with knowledge engineering is tedious and error prone.