Kahle also notes some similarity with the punctuation of Samaritan Hebrew. By the tenth century C.E., the chant in use in Judah had clearly become more complex, both because of the existence of "pazer", "geresh" and "telisha" motifs in longer verses and because the realization of a phrase ending with a given type of break varied according to the number of words and syllables in the phrase. The Tiberian Masoretes therefore decided to invent a comprehensive notation with a symbol on each word, to replace the fragmentary systems previously in use. In particular, it was necessary to invent a range of different conjunctive accents to show how to introduce and elaborate the main motif in longer phrases. (For example, "tevir" is preceded by "mercha", a short flourish, in shorter phrases but by "darga", a more elaborate run of notes, in longer phrases.) The system they devised is the one in use today, and is found in Biblical manuscripts such as the Aleppo Codex. A Masoretic treatise called "Diqduqe ha-te'amim" (precise rules of the accents) by Aaron ben Moses ben Asher survives, though both the names and the classification of the accents differ somewhat from those of the present day. As the accents were (and are) not shown on a Torah scroll, it was found necessary to have a person making hand signals to the reader to show the tune, as in the Byzantine system of neumes. This system of cheironomy survives in some communities to the present day, notably in Italy. It is speculated that both the shapes and the names of some of the accents (e.g. "tifcha", literally "hand-breadth") may refer to the hand signals rather than to the syntactical functions or melodies denoted by them. Today in most communities there is no system of hand signals and the reader learns the melody of each reading in advance. The Tiberian system spread quickly and was accepted in all communities by the 13th century. Each community re-interpreted its reading tradition so as to allocate one short musical motif to each symbol: this process has gone furthest in the Western Ashkenazi and Ottoman (Jerusalem-Sephardi, Syrian etc.) traditions. Learning the accents and their musical rendition is now an important part of the preparations for a bar mitzvah, as this is the first occasion on which a person reads from the Torah in public.