We duplicated the statistical model used by<cite> (Luo et al., 2004)</cite> , with three differences. First, no feature combination was used, to prevent long running times on the large amount of ACE data. Second, through an analysis of the validation data, we implemented seven new features, presented in Table 1. Third, as opposed to<cite> (Luo et al., 2004)</cite> , who represented all numerical features quantized, we translated each numerical feature into a set of binary features that express whether the value is in certain intervals.