The current system, without a dictionary, is fairly successful in parsing texts transcribed wherever applicable by Joyo Kanji (frequently used Chinese characters), but it is not able to parse successfully sentences containing successive phrases transcribed in Hiragana, because it recognizes the beginning of a phrase by finding a character that is not a Hiragana.
in addition, it resorts to another feature characteristic of Japanese (a head-final language) that the functional part is located at the end of a phrase.