We are grateful to Yamada and Matsumoto for letting us use their rule set, which is a slight modification of the rules used by Collins (1999) . This permits us to make exact comparisons with the parser of<cite> Yamada and Matsumoto (2003)</cite> , but also the parsers of Collins (1997) and Charniak (2000) , which are evaluated on the same data set in<cite> Yamada and Matsumoto (2003)</cite> .