By introducing all the derivation rules and onomatopoeia patterns, there are 4,560 improvements for 100,000 sentences with only 80 deteriorations and a 6.2% loss in speed.
the derivation rules of insertion and substitution of long sound symbols and lowercases produced 3,327 improvements for 100,000 sentences at high recall values (see Table 4) with only 27 deteriorations and a 3.8% loss in speed.