... ex-amples of the previous section. From the point of view of bag -of- word methods, the pairs (T1, H1)and (T1, H2) have both the same intra-pair simi-larity since the sentences of T1and ... head of constituents. Theexample of Fig. 1 shows that the placeholder0climbs up to the node governing all the NPs.5.3 Pruning irrelevant information in largetext treesOften only a portion of ... t, the set of its nodes N (t), and a set of anchors, we builda tree twith all the nodes Nthat are anchors orancestors of any anchor. Moreover, we add to tthe leaf nodes of the original...