(2011a) proposed models where N i for the ith tuple (e 1 , e 2 ) is defined as: {r j | r j (e 1 , e k ) ∈ D, e k = e 2 , r j / ∈ P i }, which is a subset of L \ P i .
z i changes as the algorithm progresses, which may impact the label assigned to the remaining mentions in that group.