<cite>Wang et al. (2006)</cite> used a range of other features, including rhythmic features of S 0 and S 1 (Sun and Jurafsky, 2003) , features from the most recently found node that is to the left or right of S 0 and S 1 , the number of words and the number of punctuations in S 0 and S 1 , the distance between S 0 and S 1 and so on.