Different hyperedges connecting these nodes are used to represent how the semantics of a node is composed from those of its child nodes.
each A k is connected to A k+1 and E k through the hyperedge A k → (A k+1 , E k ), denoting the fact that the set of mentions that start at k or later is the union of the set of mentions that start at k + 1 or later and the set of mentions that start at k. Each E k is connected to T k 1 , T k 2 , .