These rules are not used in the next experiment.
we eliminated the extracted 17,731 rules whose adjustment ratio are below 60% and obtained 4,494 rules such as : where ADJ=adjective, ADV=adverb, CC=coordinate conjuction, DET=determiner, DEM=demonstrative, NAMEP=place name, N=noun, NAME=proper noun, NT=noun meaning "time", NU=noun meaning "unit", PP=past particle, PNC=punctuation mark other than commas, V=verb (other than past form), VP=verb (past form).