 Once the line length is determined, then the most likely division(s) of the line by caesuras is also known, since they are as a rule fixed in certain positions.Thus, specifying the line-length of a Chinese poem is equivalent to specifying both the type of feet and the number of feet per line in poetry using quantitative meter.A three-character line is known from the "Three Character Classic", a book for children written in three-character eight-line verse in rhymed couplets.