Table 2.

The number of different types of features for the evidence sentence classification task

	Bag-of-words from sentence	Bag-of-words from sentence and paragraph	Bag-of-bigrams from sentence	Bag-of- bigrams from sentence and paragraph
Original lexical features	65 538	92 408	176 921	347 123
Features from RDEs	200	200	200	200

The first row is the corpus statistics from labeled data. The second row is the final feature set derived from the 200 RDEs.