Future systems developed for this task can benefit from the large amount of existing work on recognizing textual entailment (Giampiccolo et al., 2007;Giampiccolo et al., 2008;Bentivogli et al., 2009) and on detecting contradiction (Ritter et al., 2008;De Marneffe et al., 2008).
there are substantial challenges in applying the RTE tools directly to this data set.