If an entity or an entity pair appears significantly more frequently in one day's news than in recent history, the corresponding event candidates are likely to be good to generate paraphrase.
the temporal burstiness heuristic implies that a good EEC (a 1 , a 2 , t) tends to have a spike in the time series of its entities a i , or argument pair (a 1 , a 2 ), on day t. even if we have selected a good EEC for paraphrasing, it is likely that it contains a few relation phrases that are related to (but not synonymous with) the other relations included in the EEC.